1
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Ran M, Dong Y, Zhang X, Li W, Wang Z, Lin S, Yang Y, Song H, Wu W, Liu S, Zhu Y, Zheng C, Gao X. Unraveling the Mechanistic Origin of High N 2 Selectivity in Ammonia Selective Catalytic Oxidation on CuO-Based Catalyst. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:12249-12259. [PMID: 38935480 DOI: 10.1021/acs.est.4c02656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/29/2024]
Abstract
NH3 emissions from industrial sources and possibly future energy production constitute a threat to human health because of their toxicity and participation in PM2.5 formation. Ammonia selective catalytic oxidation to N2 (NH3-SCO) is a promising route for NH3 emission control, but the mechanistic origin of achieving high N2 selectivity remains elusive. Here we constructed a highly N2-selective CuO/TiO2 catalyst and proposed a CuOx dimer active site based on the observation of a quadratic dependence of NH3-SCO reaction rate on CuOx loading, ac-STEM, and ab initio thermodynamic analysis. Combining this with the identification of a critical N2H4 intermediate by in situ DRIFTS characterization, a comprehensive N2H4-mediated reaction pathway was proposed by DFT calculations. The high N2 selectivity originated from the preference for NH2 coupling to generate N2H4 over NH2 dehydrogenation on the CuOx dimer active site. This work could pave the way for the rational design of efficient NH3-SCO catalysts.
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Affiliation(s)
- Mingchu Ran
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
| | - Yi Dong
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
| | - Xiao Zhang
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
- Zhejiang Baima Lake Laboratory Co., Ltd., Hangzhou 310051, China
- Jiaxing Research Institute, Zhejiang University, Jiaxing 314000, China
| | - Weixian Li
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
| | - Zhi Wang
- Center for Electron Microscopy, Institute for Frontier and Interdisciplinary Sciences, State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology and College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Saisai Lin
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
| | - Yang Yang
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
- Jiaxing Research Institute, Zhejiang University, Jiaxing 314000, China
| | - Hao Song
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
| | - Weihong Wu
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
| | - Shaojun Liu
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
| | - Yihan Zhu
- Center for Electron Microscopy, Institute for Frontier and Interdisciplinary Sciences, State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology and College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Chenghang Zheng
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
- Zhejiang Baima Lake Laboratory Co., Ltd., Hangzhou 310051, China
- Jiaxing Research Institute, Zhejiang University, Jiaxing 314000, China
| | - Xiang Gao
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
- Zhejiang Baima Lake Laboratory Co., Ltd., Hangzhou 310051, China
- Jiaxing Research Institute, Zhejiang University, Jiaxing 314000, China
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2
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Machida M, Yamasaki N, Miyoshi T, Kusaba H, Sato T, Awaya K, Yoshida H, Ohyama J, Ohori T, Oka K, Fujii K, Ishikawa N. Catalytic NH 3 oxidation affected by the nanometric roughness of the platinum overlayer. NANOSCALE 2024; 16:9781-9790. [PMID: 38699892 DOI: 10.1039/d4nr01156b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2024]
Abstract
Pulsed cathodic arc-plasma deposition was employed to create a few nanometre-thick Pt overlayer on a 50 μm-thick Fe-Cr-Al metal (SUS) foil, resulting in an effective NH3 oxidation catalyst fabrication. This catalyst exhibited a turnover frequency (TOF) exceeding 100 times that of Pt nanoparticles. In this study, Pt overlayer catalysts with varying degrees of surface roughness were fabricated using different metal foil substrates: mirror-polished (Pt/p-SUS), unpolished (Pt/SUS) and roughened by the formation of a surface oxide layer (Pt/Al2O3/SUS). The nanoscale roughness was comprehensively analysed using electron microscopy, laser scanning confocal microscopy and chemisorption techniques. NH3 oxidation activity, measured at 200 °C, followed an increasing trend in the order of Pt/Al2O3/SUS < Pt/SUS < Pt/p-SUS, despite a decrease in the apparent Pt surface area in the same order. Consequently, the calculated TOF was markedly higher for Pt/p-SUS (267 min-1) compared to Pt/SUS (107 min-1) and Pt/Al2O3/SUS (≤22 min-1). The smooth Pt overlayer surface also favoured N2 yield over N2O at this temperature. This discovery enhances our fundamental understanding of high-TOF NH3 oxidation over Pt overlayer catalysts, which holds significance for the advancement and industrial implementation of selective NH3 oxidation processes.
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Affiliation(s)
- Masato Machida
- Division of Materials Science and Chemistry, Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto 860-8555, Japan.
- Institute of Industrial Nanomaterials, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto 860-8555, Japan
| | - Nayu Yamasaki
- Department of Applied Chemistry and Biochemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto, 860-8555, Japan
| | - Tomoya Miyoshi
- Department of Applied Chemistry and Biochemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto, 860-8555, Japan
| | - Hiroki Kusaba
- Department of Applied Chemistry and Biochemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto, 860-8555, Japan
| | - Tetsuya Sato
- Technical Division, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto, 860-8555, Japan
| | - Keisuke Awaya
- Division of Materials Science and Chemistry, Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto 860-8555, Japan.
| | - Hiroshi Yoshida
- Division of Materials Science and Chemistry, Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto 860-8555, Japan.
| | - Junya Ohyama
- Division of Materials Science and Chemistry, Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto 860-8555, Japan.
- Institute of Industrial Nanomaterials, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto 860-8555, Japan
| | - Teppei Ohori
- Isuzu Advanced Engineering Center, Ltd, 8 Tsuchidana, Fujisawa, 252-0881, Japan
| | - Kohei Oka
- Isuzu Advanced Engineering Center, Ltd, 8 Tsuchidana, Fujisawa, 252-0881, Japan
| | - Kenji Fujii
- Isuzu Advanced Engineering Center, Ltd, 8 Tsuchidana, Fujisawa, 252-0881, Japan
| | - Naoya Ishikawa
- Isuzu Advanced Engineering Center, Ltd, 8 Tsuchidana, Fujisawa, 252-0881, Japan
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3
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Zhao Y, Yi X, Dou B, Kang R, Bin F. Improving Copper Active Site Speciation on Cu-Ce/SSZ-13 for Ammonia Oxidation via Si/Al Ratio Modulation. ACS APPLIED MATERIALS & INTERFACES 2024; 16:26088-26098. [PMID: 38717977 DOI: 10.1021/acsami.4c01898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2024]
Abstract
Catalytic oxidation is a promising purification technique for ammonia (NH3) emission. However, high ignition temperatures and NOx peroxide generation limit its effectiveness due to a lack of active sites. Herein, the effects of Si/Al ratio (SAR) modulation on the speciation of copper active sites and the reaction mechanism at different acidic sites were investigated by loading CuO-CeO2 onto SSZ-13 with different SARs (Cu-Ce/SAR15, 20, and 30). Among them, Cu-Ce/SAR20 exhibits the lowest induction temperature (T20 = 180 °C) and the highest nitrogen selectivity (above 95%), attributing to a higher number of Cu2+ exchange sites. In situ IR spectroscopy and isotopic (18O2) transient response experiments indicate that more active Cu2+ in Cu-Ce/SAR20 provides sufficient Lewis acidic sites for NH3 adsorption and favors the stability of Si-OH-Al structures (Brønsted acid sites). NH3 adsorbed at Lewis acidic sites tends to form peroxide byproducts (NOx), while the NH4+ adsorbed at Brønsted acidic sites generates the key intermediate NH4NO2, which decomposes to N2 at high temperatures, thus enhancing nitrogen selectivity. The whole process mainly follows the Mars-van Krevelen (M-K) mechanism, with the Langmuir-Hinshelwood (L-H) mechanism playing a supporting role. Z2Cu2+ coordinates with adjacent Al atoms within the six-membered ring (6MR) and undergoes a slight deformation at high temperatures, facilitating the migration of the lattice oxygen. SAR plays a crucial role in local environmental speciation of reactive Cu2+, where the sufficient isolated Al provided in SAR20 pulls Cu2+ into the eight-membered ring (8MR), allowing it to come into contact with NH3 more readily.
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Affiliation(s)
- Yang Zhao
- College of Marine and Environmental Sciences, Tianjin University of Science & Technology, Tianjin 300457, PR China
| | - Xiaokun Yi
- College of Marine and Environmental Sciences, Tianjin University of Science & Technology, Tianjin 300457, PR China
- State Key Laboratory of High-Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Baojuan Dou
- College of Marine and Environmental Sciences, Tianjin University of Science & Technology, Tianjin 300457, PR China
| | - Running Kang
- State Key Laboratory of High-Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Feng Bin
- State Key Laboratory of High-Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, PR China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, PR China
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4
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Tian Y, Han Z, Li Y, Zhao H, Zeng Q, Cheng S. Pt/Al 2O 3@Ce/ZrO 2-S bifunctional catalysts prepared by mechanically milling for selective catalytic oxidation of high-concentration ammonia. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:37746-37756. [PMID: 38787474 DOI: 10.1007/s11356-024-33744-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Accepted: 05/17/2024] [Indexed: 05/25/2024]
Abstract
The selective catalytic oxidation (SCO) is an effective method for removing slipped high-concentration ammonia from NH3-fueled engine exhaust gas. Herein a novel bifunctional catalyst was synthesized by mechanically mixing sulfated Ce/ZrO2 (Ce/ZrO2-S) with a small fraction of Pt/Al2O3 (Pt 0.1 wt.%) for SCO of NH3. As expected, the introduction of a small amount of Pt/Al2O3 significantly improved NH3 conversion ability of Ce/ZrO2-S catalysts toward low-temperature direction. When the mass ratio of Pt/Al2O3 to Ce/ZrO2-S was 7.5% (the corresponding mixed catalyst was denoted as P@CZS-7.5), T90 temperature was 312 °C. More importantly, P@CZS-7.5 catalyst exhibited a much better N2 selectivity (> 96%) in a wide temperature range (320 ~ 450 °C). H2-TPR results revealed that the addition of a trace amount of Pt/Al2O3 significantly led to a distinct shift of reduction temperature peak toward low-temperature direction, thereby greatly improved the low-temperature redox performance of mixed catalysts. Furthermore, NH3-TPD and BET results showed that P@CZS-7.5 catalyst exhibited a similar NH3 adsorption capacity to Ce/ZrO2-S catalyst, while the former had a relatively higher specific surface area than the latter. It was considered as a crucial factor for P@CZS-7.5 catalyst maintaining superior N2 selectivity in high-concentration NH3 (5000 ppm) removal processes. In situ DRIFTS results indicated that P@CZS-7.5 catalyst followed the internal selective catalytic reduction (i-SCR) mechanism in NH3-SCO reactions.
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Affiliation(s)
- You Tian
- Marine Engineering College, Dalian Maritime University, Dalian, 116026, China
| | - Zhitao Han
- Marine Engineering College, Dalian Maritime University, Dalian, 116026, China.
| | - Yeshan Li
- Marine Engineering College, Dalian Maritime University, Dalian, 116026, China
| | - Hongzhe Zhao
- Marine Engineering College, Dalian Maritime University, Dalian, 116026, China
| | - Qingliang Zeng
- Marine Engineering College, Dalian Maritime University, Dalian, 116026, China
| | - Shaoshi Cheng
- Marine Engineering College, Dalian Maritime University, Dalian, 116026, China
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5
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Wang H, Murayama T, Ishida T, Shimizu KI, Sakaguchi N, Yamaguchi K, Miura H, Shishido T. The Development of the Regenerable Catalytic System in Selective Catalytic Oxidation of Ammonia with High N 2 Selectivity. ACS APPLIED MATERIALS & INTERFACES 2024; 16:18693-18702. [PMID: 38572967 DOI: 10.1021/acsami.3c17138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/05/2024]
Abstract
Supported particulate noble-metal catalysts are widely used in industrial catalytic reactions. However, these metal species, whether in the form of nanoparticles or highly dispersed entities, tend to aggregate during reactions, leading to a reduced activity or selectivity. Addressing the frequent necessity for the replacement of industrial catalysts remains a significant challenge. Herein, we demonstrate the feasibility of the 'regenerable catalytic system' exemplified by selective catalytic oxidation of ammonia (NH3-SCO) employing Ag/Al2O3 catalysts. Results demonstrate that our highly dispersed Ag catalyst (Ag HD) maintains >90% N2 selectivity at 80% NH3 conversion and >80% N2 selectivity at 100% NH3 conversion after enduring 5 cycles of reducible aggregation and oxidative dispersion. Moreover, it consistently upholds over 98% N2 selectivity at 100% NH3 conversion after 10 cycles of Ar treatment. During the aggregation-dispersion process, the Ag HD catalyst intentionally aggregated into Ag nanoparticles (Ag NP) after H2 reduction and exhibited remarkable regenerable capabilities, returning to the Ag HD state after calcination in the air. This structural evolution was characterized through in situ transmission electron microscopy, atomically resolved high-angle annular dark-field scanning transmission electron microscopy, and X-ray absorption spectroscopy, revealing the on-site oxidative dispersion of Ag NP. Additionally, in situ diffuse reflectance infrared Fourier transform spectroscopy provided insights into the exceptional N2 selectivity on Ag HD catalysts, elucidating the critical role of NO+ intermediates. Our findings suggest a sustainable and cost-effective solution for various industry applications.
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Affiliation(s)
- Haifeng Wang
- Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
- Research Center for Hydrogen Energy-Based Society, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Toru Murayama
- Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
- Research Center for Hydrogen Energy-Based Society, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan
- Yantai Key Laboratory of Gold Catalysis and Engineering, Shandong Applied Research Center of Gold Nanotechnology (Au-SDARC), School of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China
| | - Tamao Ishida
- Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
- Research Center for Hydrogen Energy-Based Society, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Ken-Ichi Shimizu
- Institute for Catalysis, Hokkaido University, Sapporo, Hokkaido 001-0021, Japan
| | - Norihito Sakaguchi
- Laboratory of Integrated Function Materials, Center for Advanced Research of Energy and Materials, Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
| | - Kazuya Yamaguchi
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Hiroki Miura
- Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
- Research Center for Hydrogen Energy-Based Society, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan
- Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, Kyoto 615-8520, Japan
| | - Tetsuya Shishido
- Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
- Research Center for Hydrogen Energy-Based Society, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan
- Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, Kyoto 615-8520, Japan
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6
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Coeck R, Houbrechts M, De Vos DE. Ammonolytic transfer dehydrogenation of amines and amides: a versatile method to valorize nitrogen compounds to nitriles. Chem Sci 2023; 14:7944-7955. [PMID: 37502329 PMCID: PMC10370574 DOI: 10.1039/d3sc02436a] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Accepted: 07/03/2023] [Indexed: 07/29/2023] Open
Abstract
The dehydrogenation of amines has been identified as an efficient method for nitrile synthesis. At present, this approach is restricted to (oxidative) dehydrogenations of primary amines, most often with specialized homogeneous catalysts. In this work, amines were transfer dehydrogenated to nitriles using simple and cheap alkenes (e.g. ethylene or propene) as hydrogen scavengers. The scope was expanded to secondary amines, tertiary amines and even aldehydes. Additional nitrogen is built in from NH3. The versatility of the process was proven by coupling it to the ammonolysis of secondary amides. This enabled us to recycle long-chain polyamides (LCPA) into monomeric compounds, i.e. α,ω-amidonitriles and dinitriles. Reactions were performed with a recyclable heterogeneous Pt catalyst, at 200 °C and with limited addition of NH3 and ethylene. High yields of up to 94% were obtained for the corresponding nitriles.
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Affiliation(s)
- Robin Coeck
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions (cMACS), KU Leuven 3001 Leuven Belgium
| | - Margot Houbrechts
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions (cMACS), KU Leuven 3001 Leuven Belgium
| | - Dirk E De Vos
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions (cMACS), KU Leuven 3001 Leuven Belgium
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7
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Cha B, Choi JY, Kim SH, Zhao S, Khan SA, Jeong B, Kim YD. In Situ Spectroscopic Studies of NH 3 Oxidation of Fe-Oxide/Al 2O 3. ACS OMEGA 2023; 8:18064-18073. [PMID: 37251163 PMCID: PMC10210185 DOI: 10.1021/acsomega.3c01380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 04/07/2023] [Indexed: 05/31/2023]
Abstract
Simple temperature-regulated chemical vapor deposition was used to disperse iron oxide nanoparticles on porous Al2O3 to create an Fe-oxide/Al2O3 structure for catalytic NH3 oxidation. The Fe-oxide/Al2O3 achieved nearly 100% removal of NH3, with N2 as a major reaction product at temperatures above 400 °C and negligible NOx emissions at all experimental temperatures. The results of a combination of in situ diffuse reflectance infrared Fourier-transform spectroscopy and near-ambient pressure-near-edge X-ray absorption fine structure spectroscopy suggest a N2H4-mediated oxidation mechanism of NH3 to N2 via the Mars-van Krevelen pathway on the Fe-oxide/Al2O3 surface. As a catalytic adsorbent-an energy-efficient approach to reducing NH3 levels in living environments via adsorption and thermal treatment of NH3-no harmful NOx emissions were produced during the thermal treatment of the NH3-adsorbed Fe-oxide/Al2O3 surface, while NH3 molecularly desorbed from the surface. A system with dual catalytic filters of Fe-oxide/Al2O3 was designed to fully oxidize this desorbed NH3 to N2 in a clean and energy-efficient manner.
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Affiliation(s)
- Byeong
Jun Cha
- Department
of Chemistry, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic
of Korea
- Center
of Scientific Instrumentation, Korea Basic
Science Institute, Ochang 28119, Republic
of Korea
| | - Ji Yoon Choi
- Department
of Chemistry, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic
of Korea
| | - Soo Hyun Kim
- Department
of Chemistry, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic
of Korea
| | - Shufang Zhao
- Department
of Chemistry, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic
of Korea
| | - Sher Ali Khan
- Department
of Chemistry, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic
of Korea
| | - Beomgyun Jeong
- Center
for Materials Analysis, Korea Basic Science
Institute, Daejeon 34133, Republic
of Korea
| | - Young Dok Kim
- Department
of Chemistry, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic
of Korea
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8
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Liu J, Xu G, An Q, Wang Y, Yu Y, He H. Heat Treatment Improves the Activity and Water Tolerance of Pt/Al 2O 3 Catalysts in Ammonia Catalytic Oxidation. ACS OMEGA 2023; 8:13944-13954. [PMID: 37091366 PMCID: PMC10116619 DOI: 10.1021/acsomega.3c00381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Accepted: 03/24/2023] [Indexed: 05/03/2023]
Abstract
Ammonia selective catalytic oxidation (NH3-SCO) is a commercial technology applied to diesel vehicles to eliminate ammonia leakage. In this study, a series of Pt/Al2O3 catalysts were synthesized by an impregnation method, and the state of Pt species was carefully adjusted by heat treatment. These Pt/Al2O3 catalysts were further systematically characterized by Brunauer-Emmett-Teller, X-ray diffraction, X-ray photoelectron spectroscopy, X-ray absorption fine structure, UV-vis, H2-tempertaure-programmed reduction, and NH3-temperature-programmed desorption. The characterization results showed that dispersed oxidized Pt species were present on conventional Pt/Al2O3 samples, while high-temperature treatment induced the aggregation of platinum species to form metallic Pt nanoparticles. The Pt/Al2O3 catalysts treated at high temperatures showed superior activity and water tolerance in the NH3-SCO reaction. Diffuse reflectance infrared Fourier-transform spectroscopy combined with mass spectrometry experiments revealed that the Lewis acid sites were more reactive than the Brønsted acid sites. Moreover, compared to oxidized Pt species, metallic Pt nanoparticles were beneficial for oxygen activation and were less affected by water vapor, thus contributing to the superior activity and water tolerance of Pt/Al-800.
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Affiliation(s)
- Jianhua Liu
- School
of Rare Earths, University of Science and
Technology of China, Hefei 230026, China
- Ganjiang
Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China
| | - Guangyan Xu
- State
Key Joint Laboratory of Environment Simulation and Pollution Control,
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Qi An
- School
of Rare Earths, University of Science and
Technology of China, Hefei 230026, China
- Ganjiang
Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China
| | - Yingjie Wang
- School
of Rare Earths, University of Science and
Technology of China, Hefei 230026, China
- Ganjiang
Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China
| | - Yunbo Yu
- School
of Rare Earths, University of Science and
Technology of China, Hefei 230026, China
- Ganjiang
Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China
- State
Key Joint Laboratory of Environment Simulation and Pollution Control,
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Hong He
- School
of Rare Earths, University of Science and
Technology of China, Hefei 230026, China
- Ganjiang
Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China
- State
Key Joint Laboratory of Environment Simulation and Pollution Control,
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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9
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Harahap BM, Ahring BK. Acetate Production from Syngas Produced from Lignocellulosic Biomass Materials along with Gaseous Fermentation of the Syngas: A Review. Microorganisms 2023; 11:microorganisms11040995. [PMID: 37110418 PMCID: PMC10143712 DOI: 10.3390/microorganisms11040995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 04/05/2023] [Accepted: 04/10/2023] [Indexed: 04/29/2023] Open
Abstract
Biotransformation of lignocellulose-derived synthetic gas (syngas) into acetic acid is a promising way of creating biochemicals from lignocellulosic waste materials. Acetic acid has a growing market with applications within food, plastics and for upgrading into a wide range of biofuels and bio-products. In this paper, we will review the microbial conversion of syngas to acetic acid. This will include the presentation of acetate-producing bacterial strains and their optimal fermentation conditions, such as pH, temperature, media composition, and syngas composition, to enhance acetate production. The influence of syngas impurities generated from lignocellulose gasification will further be covered along with the means to alleviate impurity problems through gas purification. The problem with mass transfer limitation of gaseous fermentation will further be discussed as well as ways to improve gas uptake during the fermentation.
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Affiliation(s)
- Budi Mandra Harahap
- Bioproducts, Science, and Engineering Laboratory, Washington State University Tri-Cities, 2710, Crimson Way, Richland, WA 99354, USA
- Department of Biological System Engineering, Washington State University, L. J. Smith Hall, Pullman, WA 99164, USA
| | - Birgitte K Ahring
- Bioproducts, Science, and Engineering Laboratory, Washington State University Tri-Cities, 2710, Crimson Way, Richland, WA 99354, USA
- Department of Biological System Engineering, Washington State University, L. J. Smith Hall, Pullman, WA 99164, USA
- Voiland School of Chemical Engineering and Bioengineering, Washington State University, Wegner Hall, Pullman, WA 99164, USA
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10
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Zhou L, Zhang M, Liu C, Zhang Y, Wang H, Zhang Z. Catalytic activity and mechanism of selective catalytic oxidation of ammonia by Ag-CeO 2 under different preparation conditions. RSC Adv 2023; 13:10239-10248. [PMID: 37006358 PMCID: PMC10065061 DOI: 10.1039/d2ra06381f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Accepted: 02/22/2023] [Indexed: 04/03/2023] Open
Abstract
Given the problem of the high-temperature window of CeO2 catalyst activity, this study evaluated the catalytic properties of Ag/CeO2 prepared by changing the preparation methods and loadings. Our experiments showed that Ag/CeO2-IM catalysts prepared by the equal volume impregnation method could have better activity at lower temperatures. The Ag/CeO2-IM catalyst achieves 90% NH3 conversion at 200 °C, and the main reason is that the Ag/CeO2-IM catalyst has more vital redox properties, and the NH3 catalytic oxidation temperature is lower. However, its high-temperature N2 selectivity still needs to be improved and may be related to the less acidic sites on the catalyst surface. On both catalyst surfaces, the i-SCR mechanism governs the NH3-SCO reaction.
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Affiliation(s)
- Lidai Zhou
- School of Chemistry and Environmental Engineering, Liaoning University of Technology Jinzhou 121001 China
| | - Min Zhang
- School of Environmental Science and Engineering, Tianjin University Tianjin 300350 China
| | - Caixia Liu
- School of Environmental Science and Engineering, Tianjin University Tianjin 300350 China
- State Key Laboratory of Engines, School of Mechanical Engineering, Tianjin University Tianjin 300350 China
| | - Yan Zhang
- School of Environmental Science and Engineering, Tianjin University Tianjin 300350 China
| | - Huijun Wang
- School of Environmental Science and Engineering, Tianjin University Tianjin 300350 China
| | - Ziyin Zhang
- Langfang City Beichen Entrepreneurship Resin Materials Incorporated Company Langfang 065000 China
- Hebei Province New Resin Material Technology Innovation Center Langfang 065000 China
- New Catalytic Materials Engineering Research Center for Air Pollutant Control Langfang 065000 China
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11
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Chen X, Yang J, Liu Z, Wen Y, Chen R, Chang S, Zhang A, Du C, Shan B. Origin of Ammonia Selective Oxidation Activity of SmMn 2O 5 Mullite: A First-Principles-Based Microkinetic Study. ACS APPLIED MATERIALS & INTERFACES 2023; 15:736-750. [PMID: 36538412 DOI: 10.1021/acsami.2c13501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Based on first-principles calculations and microkinetic analysis, the reaction routes and origin of the activity of SmMn2O5 mullite for the selective catalytic oxidation of ammonia (NH3-SCO) are systematically investigated on three low-index surfaces under experimentally operating conditions. Key influencing factors and contributions of different iconic intermediate species (NH*, N2H4*, and HNO*) to the overall reaction process have been identified. In detail, Mn4+ serves as the primary active site for NH3 adsorption, while lattice oxygen participates in the dehydrogenation of NH3 on (010)4+ and (001)4+ surfaces. Furthermore, the (010)4+ surface shows both the best activity and the highest N2 selectivity at low temperatures via the synergy effect of exposed Mn-Mn dimers and the most labile O2 atoms. We further evaluate the potential catalytic performances of six A-site doped (010)4+ facets, among which La, Pr, and Nd dopings are predicted to possess better catalytic performances. Our study provides deep insights into the microscope reaction mechanisms and provides the specific optimization strategy for NH3-SCO on mullite oxides.
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Affiliation(s)
- Xi Chen
- State Key Laboratory of Material Processing and Die and Mould Technology and School of Materials Science and Technology, Huazhong University of Science and Technology, Wuhan430074, Hubei, China
| | - Jiaqiang Yang
- State Key Laboratory of Material Processing and Die and Mould Technology and School of Materials Science and Technology, Huazhong University of Science and Technology, Wuhan430074, Hubei, China
| | - Zhang Liu
- State Key Laboratory of Material Processing and Die and Mould Technology and School of Materials Science and Technology, Huazhong University of Science and Technology, Wuhan430074, Hubei, China
| | - Yanwei Wen
- State Key Laboratory of Material Processing and Die and Mould Technology and School of Materials Science and Technology, Huazhong University of Science and Technology, Wuhan430074, Hubei, China
| | - Rong Chen
- State Key Laboratory of Digital Manufacturing Equipment and Technology and School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan430074, Hubei, China
| | - Shiying Chang
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metal, Kunming Institute of Precious Metals, Kunming650106, Yunnan, China
| | - Aimin Zhang
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metal, Kunming Institute of Precious Metals, Kunming650106, Yunnan, China
| | - Chun Du
- State Key Laboratory of Material Processing and Die and Mould Technology and School of Materials Science and Technology, Huazhong University of Science and Technology, Wuhan430074, Hubei, China
| | - Bin Shan
- State Key Laboratory of Material Processing and Die and Mould Technology and School of Materials Science and Technology, Huazhong University of Science and Technology, Wuhan430074, Hubei, China
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12
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Sun H, Wang H, Qu Z. Construction of CuO/CeO 2 Catalysts via the Ceria Shape Effect for Selective Catalytic Oxidation of Ammonia. ACS Catal 2023. [DOI: 10.1021/acscatal.2c05168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Hongchun Sun
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian116024, China
| | - Hui Wang
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian116024, China
| | - Zhenping Qu
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian116024, China
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13
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Xu G, Shan W, Yu Y, Shan Y, Wu X, Wu Y, Zhang S, He L, Shuai S, Pang H, Jiang X, Zhang H, Guo L, Wang S, Xiao FS, Meng X, Wu F, Yao D, Ding Y, Yin H, He H. Advances in emission control of diesel vehicles in China. J Environ Sci (China) 2023; 123:15-29. [PMID: 36521980 DOI: 10.1016/j.jes.2021.12.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Revised: 12/11/2021] [Accepted: 12/13/2021] [Indexed: 06/17/2023]
Abstract
Diesel vehicles have caused serious environmental problems in China. Hence, the Chinese government has launched serious actions against air pollution and imposed more stringent regulations on diesel vehicle emissions in the latest China VI standard. To fulfill this stringent legislation, two major technical routes, including the exhaust gas recirculation (EGR) and high-efficiency selective catalytic reduction (SCR) routes, have been developed for diesel engines. Moreover, complicated aftertreatment technologies have also been developed, including use of a diesel oxidation catalyst (DOC) for controlling carbon monoxide (CO) and hydrocarbon (HC) emissions, diesel particulate filter (DPF) for particle mass (PM) emission control, SCR for the control of NOx emission, and an ammonia slip catalyst (ASC) for the control of unreacted NH3. Due to the stringent requirements of the China VI standard, the aftertreatment system needs to be more deeply integrated with the engine system. In the future, aftertreatment technologies will need further upgrades to fulfill the requirements of the near-zero emission target for diesel vehicles.
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Affiliation(s)
- Guangyan Xu
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Wenpo Shan
- Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Yunbo Yu
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Yulong Shan
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | | | - Ye Wu
- Tsinghua University, Beijing 100084, China
| | | | - Liqiang He
- Tsinghua University, Beijing 100084, China
| | | | - Hailong Pang
- Army Military Transportation University, Tianjin 300161, China
| | | | - Heng Zhang
- Dongfeng Motor Corporation, Wuhan 430101, China
| | - Lei Guo
- China National Heavy Duty Truck Group Company Limited, Jinan 250000, China
| | - Shufen Wang
- China National Heavy Duty Truck Group Company Limited, Jinan 250000, China
| | | | | | - Feng Wu
- Zhejiang University, Hangzhou 310027, China
| | | | - Yan Ding
- Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Hang Yin
- Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Hong He
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
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14
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Wang F, Li Z, Wang C, Xu G, Chu B, Zhang C, He H. Progress on selective catalytic oxidation of ammonia (NH3‐SCO) over Ag-based catalysts. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.12.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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15
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Operando QEXAFS Study of Pt–Fe Ammonia Slip Catalysts During Realistic Driving Cycles. Top Catal 2022. [DOI: 10.1007/s11244-022-01718-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
AbstractBifunctional Fe–Pt ammonia slip catalysts were studied by operando quick-scanning extended X-ray absorption fine structure spectroscopy (QEXAFS) under conditions mimicking rapid temperature variations that occur in an automotive exhaust gas aftertreatment system during real driving. Two catalysts, Pt/Al2O3 and Fe-ZSM-5, were tested individually, as mixtures and in dual bed arrangements. Applying QEXAFS allowed to track changes of active metal state with high time resolution. It uncovered a strong dependence of the active metal state on reaction conditions and catalyst bed layout. For example, proximity to platinum stabilized iron species in their more active oxidized state and led to higher Fe-ZSM-5 activity. On the contrary, isolated iron species were more susceptible to overreduction by ammonia which led to deactivation and low selectivity. The use of transient conditions uncovered the influence of non-equilibrium phenomena on catalytic performance under industrially relevant conditions. Specifically, the effect of ammonia storage on the increase of activity was shown. This was also accompanied by elevated N2O production not observed during tests with gradual heating. Additionally, unusually high NOx selectivity was detected for Fe-ZSM-5 under these conditions. Lastly, tracking catalyst state under dynamic reaction conditions disclosed that Fe-ZSM-5 activity did not grow directly with temperature increase but rather depended on the oxidation state of Fe and surface concentration of ammonia.
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16
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Jabłońska M. Review of the application of Cu-containing SSZ-13 in NH 3-SCR-DeNO x and NH 3-SCO. RSC Adv 2022; 12:25240-25261. [PMID: 36199328 PMCID: PMC9450943 DOI: 10.1039/d2ra04301g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 08/23/2022] [Indexed: 11/21/2022] Open
Abstract
The reduction of NO x emissions has become one of the most important subjects in environmental protection. Cu-containing SSZ-13 is currently the state-of-the-art catalyst for the selective catalytic reduction of NO x with ammonia (NH3-SCR-DeNO x ). Although the current-generation catalysts reveal enhanced activity and remarkable hydrothermal stability, still open challenges appear. Thus, this review focuses on the progress of Cu-containing SSZ-13 regarding preparation methods, hydrothermal resistance and poisoning as well as reaction mechanisms in NH3-SCR-DeNO x . Remarkably, the paper reviews also the progress of Cu-containing SSZ-13 in the selective ammonia oxidation into nitrogen and water vapor (NH3-SCO). The dynamics in the NH3-SCR-DeNO x and NH3-SCO fields make this review timely.
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Affiliation(s)
- Magdalena Jabłońska
- Institute of Chemical Technology, Universität Leipzig Linnéstr. 3 04103 Leipzig Germany
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17
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A Comparative Mini-Review on Transition Metal Oxides Applied for the Selective Catalytic Ammonia Oxidation (NH3-SCO). MATERIALS 2022; 15:ma15144770. [PMID: 35888236 PMCID: PMC9321034 DOI: 10.3390/ma15144770] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Revised: 06/29/2022] [Accepted: 07/05/2022] [Indexed: 02/01/2023]
Abstract
The selective catalytic oxidation of NH3 (NH3-SCO) into N2 and H2O is an efficient technology for NH3 abatement in diesel vehicles. However, the catalysts dedicated to NH3-SCO are still under development. One of the groups of such catalysts constituted transition metal-based catalysts, including hydrotalcite-derived mixed metal oxides. This class of materials is characterized by tailored composition, homogenously dispersed mixed metal oxides, exhibiting high specific surface area and thermal stability. Thus, firstly, we give a short introduction to the structure and composition of hydrotalcite-like materials and their applications in NH3-SCO. Secondly, an overview of other transition metal-based catalysts reported in the literature is given, following a comparison of both groups. The challenges in NH3-SCO applications are provided, while the reaction mechanisms are discussed for particular systems.
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18
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Tang Z, Surin I, Rasmussen A, Krumeich F, Kondratenko EV, Kondratenko VA, Pérez‐Ramírez J. Ceria‐Supported Gold Nanoparticles as a Superior Catalyst for Nitrous Oxide Production via Ammonia Oxidation. Angew Chem Int Ed Engl 2022; 61:e202200772. [DOI: 10.1002/anie.202200772] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Indexed: 12/21/2022]
Affiliation(s)
- Zhenchen Tang
- Institute for Chemical and Bioengineering Department of Chemistry and Applied Biosciences ETH Zürich Vladimir-Prelog-Weg 1 8093 Zürich Switzerland
| | - Ivan Surin
- Institute for Chemical and Bioengineering Department of Chemistry and Applied Biosciences ETH Zürich Vladimir-Prelog-Weg 1 8093 Zürich Switzerland
| | - Asbjörn Rasmussen
- Institute for Chemical and Bioengineering Department of Chemistry and Applied Biosciences ETH Zürich Vladimir-Prelog-Weg 1 8093 Zürich Switzerland
| | - Frank Krumeich
- Laboratory of Inorganic Chemistry Department of Chemistry and Applied Biosciences ETH Zürich Vladimir-Prelog-Weg 1 8093 Zürich Switzerland
| | - Evgenii V. Kondratenko
- Department of Catalyst Discovery and Reaction Engineering Leibniz-Institut für Katalyse Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Vita A. Kondratenko
- Department of Catalyst Discovery and Reaction Engineering Leibniz-Institut für Katalyse Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Javier Pérez‐Ramírez
- Institute for Chemical and Bioengineering Department of Chemistry and Applied Biosciences ETH Zürich Vladimir-Prelog-Weg 1 8093 Zürich Switzerland
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19
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Lan T, Deng J, Zhang X, Wang F, Liu X, Cheng D, Zhang D. Unraveling the Promotion Effects of Dynamically Constructed CuO x-OH Interfacial Sites in the Selective Catalytic Oxidation of Ammonia. ACS Catal 2022. [DOI: 10.1021/acscatal.1c05676] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Tianwei Lan
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Jiang Deng
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Xiaoyu Zhang
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Fuli Wang
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Xiangyu Liu
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Danhong Cheng
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Dengsong Zhang
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
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20
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Light alloying element-regulated noble metal catalysts for energy-related applications. CHINESE JOURNAL OF CATALYSIS 2022. [DOI: 10.1016/s1872-2067(21)63899-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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21
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Tang Z, Surin I, Rasmussen A, Krumeich F, Kondratenko EV, Kondratenko VA, Pérez-Ramírez J. Ceria‐Supported Gold Nanoparticles as a Superior Catalyst for Nitrous Oxide Production via Ammonia Oxidation. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202200772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Zhenchen Tang
- Eidgenossische Technische Hochschule Zurich Chemistry and Applied Biosciences SWITZERLAND
| | - Ivan Surin
- Eidgenossische Technische Hochschule Zurich Chemistry and Applied Biosciences SWITZERLAND
| | - Asbjörn Rasmussen
- Eidgenossische Technische Hochschule Zurich Chemistry and Applied Biosciences SWITZERLAND
| | - Frank Krumeich
- Eidgenossische Technische Hochschule Zurich Chemistry and Applied Biosciences SWITZERLAND
| | | | | | - Javier Pérez-Ramírez
- ETH Zurich Institute for Chemical and Bioengineering ETH HönggerbergVladimir-Prelog-Weg 1HCI E125 CH-8093 Zurich SWITZERLAND
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22
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A comparative study of various transition metal overlayer catalysts for low-temperature NH3 oxidation under dry and wet conditions. Catal Today 2022. [DOI: 10.1016/j.cattod.2021.06.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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23
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Guo Y, Ma L, Li Z, Liu Z, Chang H, Zhao X, Yan N. Specific reactivity of 4d and 5d transition metals supported over CeO 2 for ammonia oxidation. Catal Sci Technol 2022. [DOI: 10.1039/d2cy01380k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pt/CeO2 catalysts were most active in selective catalytic oxidation of ammonia, where Pt triggered the activation of surface lattice oxygen, and the dehydrogenation of ammonia assisted by surface lattice oxygen was the rate-determining step.
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Affiliation(s)
- Yitong Guo
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Lei Ma
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zihao Li
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zhisong Liu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Huazhen Chang
- School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
| | - Xiaoran Zhao
- Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming, State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Naiqiang Yan
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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24
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Svintsitskiy DA, Sokovikov NA, Slavinskaya EM, Fedorova EA, Boronin AI. Delafossite Ag
2
CuMnO
4
is a Novel Catalytic Material for Low‐Temperature Oxidation of CO and NH
3. ChemCatChem 2021. [DOI: 10.1002/cctc.202101697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Nikolai A. Sokovikov
- Boreskov Institute of Catalysiss Pr. Lavrentieva 5 Novosibirsk 630090 Russia
- Novosibirsk State University Pirogova St. 2 Novosibirsk 630090 Russia
| | | | | | - Andrei I. Boronin
- Boreskov Institute of Catalysiss Pr. Lavrentieva 5 Novosibirsk 630090 Russia
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25
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Catalytic Oxidation of Ammonia over Cerium-Modified Copper Aluminium Zinc Mixed Oxides. MATERIALS 2021; 14:ma14216581. [PMID: 34772134 PMCID: PMC8585330 DOI: 10.3390/ma14216581] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 10/26/2021] [Accepted: 10/30/2021] [Indexed: 11/17/2022]
Abstract
Copper-containing mixed metal oxides are one of the most promising catalysts of selective catalytic oxidation of ammonia. These materials are characterized by high catalytic efficiency; however, process selectivity to dinitrogen is still an open challenge. The set of Cu-Zn-Al-O and Ce/Cu-Zn-Al-O mixed metal oxides were tested as catalysts of selective catalytic oxidation of ammonia. At the low-temperature range, from 250 °C up to 350 °C, materials show high catalytic activity and relatively high selectivity to dinitrogen. Samples with the highest Cu loading 12 and 15 mol.% of total cation content were found to be the most active materials. Additional sample modification by wet impregnation of cerium (8 wt.%) improves catalytic efficiency, especially N2 selectivity. The comparison of catalytic tests with results of physicochemical characterization allows connecting the catalysts efficiency with the form and distribution of CuO on the samples’ surface. The bulk-like well-developed phases were associated with sample activity, while the dispersed CuO phases with dinitrogen selectivity. Material characterization included phase composition analysis (X-ray powder diffraction, UV-Vis diffuse reflectance spectroscopy), determination of textural properties (low-temperature N2 sorption, scanning electron microscopy) and sample reducibility analysis (H2 temperature-programmed reduction).
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26
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Jabłońska M. Progress on Noble Metal-Based Catalysts Dedicated to the Selective Catalytic Ammonia Oxidation into Nitrogen and Water Vapor (NH 3-SCO). Molecules 2021; 26:6461. [PMID: 34770870 PMCID: PMC8587564 DOI: 10.3390/molecules26216461] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 10/19/2021] [Accepted: 10/25/2021] [Indexed: 11/17/2022] Open
Abstract
A recent development for selective ammonia oxidation into nitrogen and water vapor (NH3-SCO) over noble metal-based catalysts is covered in the mini-review. As ammonia (NH3) can harm human health and the environment, it led to stringent regulations by environmental agencies around the world. With the enforcement of the Euro VI emission standards, in which a limitation for NH3 emissions is proposed, NH3 emissions are becoming more and more of a concern. Noble metal-based catalysts (i.e., in the metallic form, noble metals supported on metal oxides or ion-exchanged zeolites, etc.) were rapidly found to possess high catalytic activity for NH3 oxidation at low temperatures. Thus, a comprehensive discussion of property-activity correlations of the noble-based catalysts, including Pt-, Pd-, Ag- and Au-, Ru-based catalysts is given. Furthermore, due to the relatively narrow operating temperature window of full NH3 conversion, high selectivity to N2O and NOx as well as high costs of noble metal-based catalysts, recent developments are aimed at combining the advantages of noble metals and transition metals. Thus, also a brief overview is provided about the design of the bifunctional catalysts (i.e., as dual-layer catalysts, mixed form (mechanical mixture), hybrid catalysts having dual-layer and mixed catalysts, core-shell structure, etc.). Finally, the general conclusions together with a discussion of promising research directions are provided.
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Affiliation(s)
- Magdalena Jabłońska
- Institute of Chemical Technology, Universität Leipzig, Linnéstr. 3, 04103 Leipzig, Germany
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27
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Chen Y, Chen X, Ma X, Tang Y, Zhao Y, Zhang A, Wang C, Du C, Shan B. Selective catalytic oxidation of ammonia over AMn2O5 (A = Sm,Y,Gd) and reaction selectivity promotion through Nb decoration. J Catal 2021. [DOI: 10.1016/j.jcat.2021.07.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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28
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Liu W, Long Y, Tong X, Yin Y, Li X, Hu J. Transition metals modified commercial SCR catalysts as efficient catalysts in NH3-SCO and NH3-SCR reactions. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111888] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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29
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Selective catalytic oxidation of ammonia to nitrogen over zeolite-supported Pt-Au catalysts: Effects of alloy formation and acid sites. J Catal 2021. [DOI: 10.1016/j.jcat.2021.08.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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30
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Wang C, Ren D, Harle G, Qin Q, Guo L, Zheng T, Yin X, Du J, Zhao Y. Ammonia removal in selective catalytic oxidation: Influence of catalyst structure on the nitrogen selectivity. JOURNAL OF HAZARDOUS MATERIALS 2021; 416:125782. [PMID: 33838505 DOI: 10.1016/j.jhazmat.2021.125782] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 03/18/2021] [Accepted: 03/25/2021] [Indexed: 06/12/2023]
Abstract
Selective catalytic oxidation is regarded as an effective and favored method for the removal of hazardous ammonia. A number of M-Pt/USY (M=Mn, Fe, Ce and Pr) catalysts were prepared and the resulting materials were characterized using N2 adsorption/desorption, XRD, TEM, NH3-TPD, XPS and H2-TPR. It was found that the addition of non-stoichiometric metal oxides to Pt/USY leads to the generation of additional acid sites for ammonia chemisorption and that N2 selectivity improved with increased strong acidity of the bi-functional catalysts. The oxidation state of active Pt could be adjusted by the introduction of non-stoichiometric metal oxides with increased concentrations of oxidized Ptδ+ species observed in the order of FeOx >CeO2-x >MnO2-x >Pr6O11. High valence platinum surrounded by atomic oxygen that can act as a proton scavenger to drive ammonia activation, inhibiting O2 dissociation and therefore improve N2 selectivity. Fe-containing USY zeolite is demonstrated to be a preferred catalyst for the removal of ammonia, due to its high N2 selectivity and good hydrothermal stability.
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Affiliation(s)
- Chengxiong Wang
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China; State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application, Kunming Sino-platinum Metals Catalysts Co. Ltd., Kunming 650106, China.
| | - Dezhi Ren
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China; State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application, Kunming Sino-platinum Metals Catalysts Co. Ltd., Kunming 650106, China
| | - Gavin Harle
- State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application, Kunming Sino-platinum Metals Catalysts Co. Ltd., Kunming 650106, China
| | - Qinggao Qin
- State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application, Kunming Sino-platinum Metals Catalysts Co. Ltd., Kunming 650106, China
| | - Lv Guo
- State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application, Kunming Sino-platinum Metals Catalysts Co. Ltd., Kunming 650106, China
| | - Tingting Zheng
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China; State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application, Kunming Sino-platinum Metals Catalysts Co. Ltd., Kunming 650106, China
| | - Xuemei Yin
- State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application, Kunming Sino-platinum Metals Catalysts Co. Ltd., Kunming 650106, China
| | - Junchen Du
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China; State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application, Kunming Sino-platinum Metals Catalysts Co. Ltd., Kunming 650106, China
| | - Yunkun Zhao
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China; State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application, Kunming Sino-platinum Metals Catalysts Co. Ltd., Kunming 650106, China.
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31
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Wang H, Lin M, Murayama T, Feng S, Haruta M, Miura H, Shishido T. Ag Size/Structure-Dependent Effect on Low-Temperature Selective Catalytic Oxidation of NH 3 over Ag/MnO 2. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01130] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Haifeng Wang
- Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
| | - Mingyue Lin
- Research Center for Gold Chemistry, Tokyo Metropolitan University, Tokyo 192-0397, Japan
- Research Center for Hydrogen Energy-Based Society, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Toru Murayama
- Research Center for Gold Chemistry, Tokyo Metropolitan University, Tokyo 192-0397, Japan
- Research Center for Hydrogen Energy-Based Society, Tokyo Metropolitan University, Tokyo 192-0397, Japan
- Yantai Key Laboratory of Gold Catalysis and Engineering, Shandong Applied Research Center of Gold Nanotechnology (Au-SDARC), School of Chemistry & Chemical Engineering, Yantai University, Yantai 264005, China
| | - Shixiang Feng
- Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
| | - Masatake Haruta
- Research Center for Gold Chemistry, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Hiroki Miura
- Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
- Research Center for Hydrogen Energy-Based Society, Tokyo Metropolitan University, Tokyo 192-0397, Japan
- Elements Strategy Initiative for Catalysts & Batteries, Kyoto University, Kyoto 615-8520, Japan
| | - Tetsuya Shishido
- Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
- Research Center for Gold Chemistry, Tokyo Metropolitan University, Tokyo 192-0397, Japan
- Research Center for Hydrogen Energy-Based Society, Tokyo Metropolitan University, Tokyo 192-0397, Japan
- Elements Strategy Initiative for Catalysts & Batteries, Kyoto University, Kyoto 615-8520, Japan
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32
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Svintsitskiy DA, Slavinskaya EM, Kibis LS, Stadnichenko AI, Fedorova EA, Stonkus OA, Korneeva EV, Romanenko AV, Boronin AI. EFFECT OF THE SUPPORT NATURE ON THE PHYSICOCHEMICAL PROPERTIES OF PLATINUM CATALYSTS FOR AMMONIA OXIDATION. J STRUCT CHEM+ 2021. [DOI: 10.1134/s0022476621040120] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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33
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Modified Layered Silicas as Catalysts for Conversion of Nitrogen Pollutants in Flue Gases—A Review. Catalysts 2021. [DOI: 10.3390/catal11050644] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
This paper is focused on the recent achievements in the studies of modified layered zeolites and cationic layered clay minerals. These materials are very promising catalysts in green chemistry processes, such as selective catalytic reduction of NOx with ammonia (NH3-SCR) and selective catalytic oxidation of ammonia to dinitrogen (NH3-SCO). Special attention is paid to the roles of the micro- and mesoporous structures of the catalytic materials, the type and location of deposited transition metals, as well as surface acidity in the design of effective catalysts for the NH3-SCR and NH3-SCO processes. The majority of the presented analysis is based on the authors’ research.
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34
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Xu G, Zhang Y, Lin J, Wang Y, Shi X, Yu Y, He H. Unraveling the Mechanism of Ammonia Selective Catalytic Oxidation on Ag/Al 2O 3 Catalysts by Operando Spectroscopy. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01054] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Guangyan Xu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Yu Zhang
- State Key Laboratory of Engine Reliability, Weifang 261061, China
| | - Jingguo Lin
- State Key Laboratory of Engine Reliability, Weifang 261061, China
| | - Yibao Wang
- State Key Laboratory of Engine Reliability, Weifang 261061, China
| | - Xiaoyan Shi
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yunbo Yu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hong He
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
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35
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Decarolis D, Clark AH, Pellegrinelli T, Nachtegaal M, Lynch EW, Catlow CRA, Gibson EK, Goguet A, Wells PP. Spatial Profiling of a Pd/Al 2O 3 Catalyst during Selective Ammonia Oxidation. ACS Catal 2021; 11:2141-2149. [PMID: 33643682 PMCID: PMC7901671 DOI: 10.1021/acscatal.0c05356] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 01/08/2021] [Indexed: 11/28/2022]
Abstract
![]()
The utilization of operando spectroscopy has allowed us to watch the
dynamic nature of supported metal nanoparticles. However, the realization that subtle
changes to environmental conditions affect the form of the catalyst necessitates that we
assess the structure of the catalyst across the reactant/product gradient that exists
across a fixed bed reactor. In this study, we have performed spatial profiling of a
Pd/Al2O3 catalyst during NH3 oxidation,
simultaneously collecting mass spectrometry and X-ray absorption spectroscopy data at
discrete axial positions along the length of the catalyst bed. The spatial analysis has
provided unique insights into the structure–activity relationships that govern
selective NH3 oxidation—(i) our data is consistent with the presence
of PdNx after the spectroscopic signatures for bulk
PdNx disappear and that there is a direct correlation to
the presence of this structure and the selectivity toward N2; (ii) at high
temperatures, ≥400 °C, we propose that there are two simultaneous reaction
pathways—the oxidation of NH3 to NOx by
PdO and the subsequent catalytic reduction of NOx by
NH3 to produce N2. The results in this study confirm the
structural and catalytic diversity that exists during catalysis and the need for such an
understanding if improvements to important emission control technologies, such as the
selective catalytic oxidation of NH3, are to be made.
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Affiliation(s)
- Donato Decarolis
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff CF10 3AT, U.K
- UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Lab, Harwell, Oxfordshire OX11 0FA, U.K
| | - Adam H. Clark
- Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland
| | - Tommaso Pellegrinelli
- School of Chemistry, Queen’s University Belfast, David Keir Building, Stranmillis Road, Belfast BT9 5AG, U.K
| | - Maarten Nachtegaal
- Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland
| | - Evan W. Lynch
- UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Lab, Harwell, Oxfordshire OX11 0FA, U.K
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, U.K
| | - C. Richard A. Catlow
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff CF10 3AT, U.K
- UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Lab, Harwell, Oxfordshire OX11 0FA, U.K
- Department of Chemistry, University College London, 20 Gordon Street, London WC1 HOAJ, U.K
| | - Emma K. Gibson
- UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Lab, Harwell, Oxfordshire OX11 0FA, U.K
- School of Chemistry, University of Glasgow, Joseph Black Building, Glasgow G12 8QQ, U.K
| | - Alexandre Goguet
- UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Lab, Harwell, Oxfordshire OX11 0FA, U.K
- School of Chemistry, Queen’s University Belfast, David Keir Building, Stranmillis Road, Belfast BT9 5AG, U.K
| | - Peter P. Wells
- UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Lab, Harwell, Oxfordshire OX11 0FA, U.K
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, U.K
- Diamond Light Source Ltd., Harwell Science and Innovation Campus, Chilton, Didcot OX11 0DE, U.K
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36
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Gu NX, Oyala PH, Peters JC. Hydrazine Formation via Coupling of a Nickel(III)-NH 2 Radical. Angew Chem Int Ed Engl 2021; 60:4009-4013. [PMID: 33152166 PMCID: PMC7902478 DOI: 10.1002/anie.202013119] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Indexed: 12/12/2022]
Abstract
M(NHx ) intermediates involved in N-N bond formation are central to ammonia oxidation (AO) catalysis, an enabling technology to ultimately exploit ammonia (NH3 ) as an alternative fuel source. While homocoupling of a terminal amide species (M-NH2 ) to form hydrazine (N2 H4 ) has been proposed, well-defined examples are without precedent. Herein, we discuss the generation and electronic structure of a NiIII -NH2 species that undergoes bimolecular coupling to generate a NiII 2 (N2 H4 ) complex. This hydrazine adduct can be further oxidized to a structurally unusual Ni2 (N2 H2 ) species; this releases N2 in the presence of NH3 , thus establishing a synthetic cycle for Ni-mediated AO. Distribution of the redox load for H2 N-NH2 formation via NH2 coupling between two metal centers presents an attractive strategy for AO catalysis using Earth-abundant, late first-row metals.
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Affiliation(s)
- Nina X Gu
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Paul H Oyala
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Jonas C Peters
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
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37
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Cerrillo JL, Lopes CW, Rey F, Palomares AE. The Influence of the Support Nature and the Metal Precursor in the Activity of Pd‐based Catalysts for the Bromate Reduction Reaction. ChemCatChem 2021. [DOI: 10.1002/cctc.202001797] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jose L. Cerrillo
- Instituto de Tecnología Química (CSIC-Universitat Politècnica de València) Camino Vera s.n. Valencia 46022 Spain
| | - Christian W. Lopes
- Instituto de Tecnología Química (CSIC-Universitat Politècnica de València) Camino Vera s.n. Valencia 46022 Spain
- Institute of Chemistry Universidade Federal do Rio Grande do Sul Avenida Bento Gonçalves, 9500 91509-900 Porto Alegre Brazil
| | - Fernando Rey
- Instituto de Tecnología Química (CSIC-Universitat Politècnica de València) Camino Vera s.n. Valencia 46022 Spain
| | - Antonio E. Palomares
- Instituto de Tecnología Química (CSIC-Universitat Politècnica de València) Camino Vera s.n. Valencia 46022 Spain
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38
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Slavinskaya EM, Kibis LS, Stonkus OA, Svintsitskiy DA, Stadnichenko AI, Fedorova EA, Romanenko AV, Marchuk V, Doronkin DE, Boronin AI. The Effects of Platinum Dispersion and Pt State on Catalytic Properties of Pt/Al
2
O
3
in NH
3
Oxidation. ChemCatChem 2021. [DOI: 10.1002/cctc.202001320] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Elena M. Slavinskaya
- Boreskov Institute of Catalysis SB RAS Pr. Lavrentieva 5 630090 Novosibirsk Russia
| | - Lidiya S. Kibis
- Boreskov Institute of Catalysis SB RAS Pr. Lavrentieva 5 630090 Novosibirsk Russia
| | - Olga A. Stonkus
- Boreskov Institute of Catalysis SB RAS Pr. Lavrentieva 5 630090 Novosibirsk Russia
| | | | | | | | | | - Vasyl Marchuk
- Institute for Chemical Technology and Polymer Chemistry Karlsruhe Institute of Technology (KIT) Engesserstr. 20 76131 Karlsruhe Germany
| | - Dmitry E. Doronkin
- Institute for Chemical Technology and Polymer Chemistry Karlsruhe Institute of Technology (KIT) Engesserstr. 20 76131 Karlsruhe Germany
- Institute of Catalysis Research and Technology Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Andrei I. Boronin
- Boreskov Institute of Catalysis SB RAS Pr. Lavrentieva 5 630090 Novosibirsk Russia
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39
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Kim J, Lee S, Ha HP. Supercritical Carbon Dioxide Extraction-Mediated Amendment of a Manganese Oxide Surface Desired to Selectively Transform Nitrogen Oxides and/or Ammonia. ACS Catal 2021. [DOI: 10.1021/acscatal.0c03704] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Jongsik Kim
- Extreme Materials Research Center, Korea Institute of Science and Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, South Korea
| | - Seokhyun Lee
- Extreme Materials Research Center, Korea Institute of Science and Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, South Korea
| | - Heon Phil Ha
- Extreme Materials Research Center, Korea Institute of Science and Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, South Korea
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40
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Gu NX, Oyala PH, Peters JC. Hydrazine Formation via Coupling of a Nickel(III)–NH
2
Radical. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202013119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Nina X. Gu
- Division of Chemistry and Chemical Engineering California Institute of Technology Pasadena CA 91125 USA
| | - Paul H. Oyala
- Division of Chemistry and Chemical Engineering California Institute of Technology Pasadena CA 91125 USA
| | - Jonas C. Peters
- Division of Chemistry and Chemical Engineering California Institute of Technology Pasadena CA 91125 USA
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41
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Machida M, Tokudome Y, Maeda A, Koide T, Hirakawa T, Sato T, Tsushida M, Yoshida H, Ohyama J, Fujii K, Ishikawa N. Nanometric Iridium Overlayer Catalysts for High-Turnover NH 3 Oxidation with Suppressed N 2O Formation. ACS OMEGA 2020; 5:32814-32822. [PMID: 33376920 PMCID: PMC7758949 DOI: 10.1021/acsomega.0c05443] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2020] [Accepted: 12/02/2020] [Indexed: 06/12/2023]
Abstract
In the present study, we prepared a 12 nm thick Ir overlayer via pulsed cathodic arc plasma deposition on a 50 μm thick Fe-Cr-Al metal (SUS) foil. Using this thin-film catalyst made NH3-O2 reactions more environmentally benign due to a much lower selectivity for undesirable N2O (<5%) than that of a Pt overlayer (∼70%) at 225 °C. Despite its small surface area, Ir/SUS exhibited promising activity as an ammonia slip catalyst according to a turnover frequency (TOF) >70-fold greater than that observed with conventional Ir nanoparticle catalysts supported on γ-Al2O3. We found that the high-TOF NH3 oxidation was associated with the stability of the metallic Ir surface against oxidation by excess O2 present in simulated diesel exhaust. Additionally, we found that the Ir overlayer structure was thermally unstable at reaction temperatures ≥400 °C and at which point the Ir surface coverage dropped significantly; however, thermal deterioration was substantially mitigated by inserting a 250 nm thick Zr buffer layer between the Ir overlayer and the SUS foil substrate (Ir/Zr/SUS). Although N2O formation was suppressed by NH3 oxidation over Ir/Zr/SUS, other undesired byproducts (i.e., NO and NO2) were readily converted to N2 by coupling with a V2O5-WO3/TiO2 catalyst in a second reactor for selective catalytic reduction by NH3. These results demonstrated that this tandem reactor configuration converted NH3 to N2 with nearly complete selectivity at a range of 200-600 °C in the presence of excess O2 (8%) and H2O (10%).
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Affiliation(s)
- Masato Machida
- Division
of Materials Science and Chemistry, Faculty of Advanced Science and
Technology, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto 860-8555, Japan
- Elements
Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, 1-30 Goryo-Ohara, Nishikyo, Kyoto 615-8245, Japan
| | - Yurika Tokudome
- Department
of Applied Chemistry and Biochemistry, Graduate School of Science
and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto 860-8555, Japan
| | - Akihide Maeda
- Department
of Applied Chemistry and Biochemistry, Graduate School of Science
and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto 860-8555, Japan
| | - Tomoyo Koide
- Department
of Applied Chemistry and Biochemistry, Graduate School of Science
and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto 860-8555, Japan
| | - Taiki Hirakawa
- Department
of Applied Chemistry and Biochemistry, Graduate School of Science
and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto 860-8555, Japan
| | - Tetsuya Sato
- Technical
Division, Faculty of Engineering, Kumamoto
University, 2-39-1 Kurokami, Chuo, Kumamoto 860-8555, Japan
| | - Masayuki Tsushida
- Technical
Division, Faculty of Engineering, Kumamoto
University, 2-39-1 Kurokami, Chuo, Kumamoto 860-8555, Japan
| | - Hiroshi Yoshida
- Division
of Materials Science and Chemistry, Faculty of Advanced Science and
Technology, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto 860-8555, Japan
- Elements
Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, 1-30 Goryo-Ohara, Nishikyo, Kyoto 615-8245, Japan
| | - Junya Ohyama
- Division
of Materials Science and Chemistry, Faculty of Advanced Science and
Technology, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto 860-8555, Japan
- Elements
Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, 1-30 Goryo-Ohara, Nishikyo, Kyoto 615-8245, Japan
| | - Kenji Fujii
- Isuzu
Advanced Engineering Center, Ltd., 8 Tsuchidana, Fujisawa 252-0881, Japan
| | - Naoya Ishikawa
- Isuzu
Advanced Engineering Center, Ltd., 8 Tsuchidana, Fujisawa 252-0881, Japan
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42
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Abstract
A series of iron functionalized hydroxyapatite (Fe/HAP) samples with different metal loading (2 < wt.% Fe < 13) was prepared by a flash ionic exchange procedure from iron(III) nitrate as precursor and tested in some environmental air-quality protection reactions such as the catalytic reduction of NOx by NH3 (NH3-SCR), catalytic oxidation of NH3 (NH3-SCO) and catalytic N2O decomposition. The catalytic performances of the Fe/HAP catalysts were determined under flow conditions as a function of temperature and using reactant concentrations typical of polluting gaseous emissions from industrial vents. Physico-chemical characterization with various techniques of study (UV-DR and Mössbauer spectroscopies, NH3 titration, N2-physisorption, and XRPD analyses) provided valuable information on Fe-speciation, acidity, morphology, and structure of the samples. In general, highly dispersed Fe3+ centers were the predominant species, irrespective of Fe-loading, while just low percentage (≤15%) of FexOy nanoclusters (2 < size/nm < 4) was detected on the samples. As expected, the differences in iron concentration produced a diversified effect of both catalyst properties and catalytic activity, comprising the conversion and selectivity profiles, different for each reaction considered. The obtained results indicate a good potentiality for the eco-friendly Fe-catalysts for some environmental reactions of air protection.
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43
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Catalytic Performance of Spherical MCM-41 Modified with Copper and Iron as Catalysts of NH 3-SCR Process. MOLECULES (BASEL, SWITZERLAND) 2020; 25:molecules25235651. [PMID: 33266178 PMCID: PMC7730084 DOI: 10.3390/molecules25235651] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 11/27/2020] [Accepted: 11/28/2020] [Indexed: 11/18/2022]
Abstract
Spherical MCM-41 with various copper and iron loadings was prepared by surfactant directed co-condensation method. The obtained samples were characterized with respect to their structure (X-ray diffraction, XRD), texture (N2 sorption), morphology (scanning electron microscopy, SEM), chemical composition (inductively coupled plasma optical emission spectrometry, ICP-OES), surface acidity (temperature programmed desorption of ammonia, NH3-TPD), form, and aggregation of iron and copper species (diffuse reflectance UV-Vis spectroscopy, UV-Vis DRS) as well as their reducibility (temperature programmed reduction with hydrogen, H2-TPR). The spherical MCM-41 samples modified with transition metals were tested as catalysts of selective catalytic reduction of NO with ammonia (NH3-SCR). Copper containing catalysts presented high catalytic activity at low-temperature NH3-SCR with a very high selectivity to nitrogen, which is desired reaction products. Similar results were obtained for iron containing catalysts, however in this case the loadings and forms of iron incorporated into silica samples very strongly influenced catalytic performance of the studied samples. The efficiency of the NH3-SCR process at higher temperatures was significantly limited by the side reaction of direct ammonia oxidation. The reactivity of ammonia molecules chemisorbed on the catalysts surface in NO reduction (NH3-SCR) and their selective oxidation (NH3-SCO) was verified by temperature-programmed surface reactions.
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44
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Święs A, Rutkowska M, Kowalczyk A, Díaz U, Palomares AE, Chmielarz L. Ferrierite and Its Delaminated Forms Modified with Copper as Effective Catalysts for NH 3-SCO Process. MATERIALS 2020; 13:ma13214885. [PMID: 33143262 PMCID: PMC7662331 DOI: 10.3390/ma13214885] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 10/22/2020] [Accepted: 10/28/2020] [Indexed: 11/26/2022]
Abstract
Ferrierites and their delaminated forms (ITQ-6), containing aluminum or titanium in the zeolite framework, were synthetized and modified with copper by an ion-exchange method. The obtained samples were characterized with respect to their chemical composition (ICP-OES), structure (XRD, UV-Vis DRS), textural parameters (N2-sorption), surface acidity (NH3-TPD), form and reducibility of deposited copper species (UV-Vis DRS and H2-TPR). Ferrierites and delaminated ITQ-6 zeolites modified with copper were studied as catalysts for the selective catalytic oxidation of ammonia to dinitrogen (NH3-SCO). It was shown that aggregated copper oxide species, which were preferentially formed on Ti-zeolites, were catalytically active in direct low-temperature ammonia oxidation to NO, while copper introduced into Al-zeolites was present mainly in the form of monomeric copper cations catalytically active in selective reduction of NO by ammonia to dinitrogen. It was postulated that ammonia oxidation in the presence of the studied catalysts proceeds according to the internal-selective catalytic reduction mechanism (i-SCR) and therefore the suitable ratio between aggregated copper oxide species and monomeric copper cations is necessary to obtain active and selective catalysts for the NH3-SCO process. Cu/Al-ITQ-6 presented the best catalytic properties possibly due to the most optimal ratio of these copper species.
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Affiliation(s)
- Aneta Święs
- Faculty of Chemistry, Jagiellonian University in Kraków, Gronostajowa 2, 30-387 Kraków, Poland; (A.Ś.); (M.R.); (A.K.)
| | - Małgorzata Rutkowska
- Faculty of Chemistry, Jagiellonian University in Kraków, Gronostajowa 2, 30-387 Kraków, Poland; (A.Ś.); (M.R.); (A.K.)
| | - Andrzej Kowalczyk
- Faculty of Chemistry, Jagiellonian University in Kraków, Gronostajowa 2, 30-387 Kraków, Poland; (A.Ś.); (M.R.); (A.K.)
| | - Urbano Díaz
- Instituto de Tecnología Química, Universitat Politècnica de València–Consejo Superior de Investigaciones Científicas, Avd. de los Naranjos s/n, 46022 Valencia, Spain; (U.D.); (A.E.P.)
| | - Antonio E. Palomares
- Instituto de Tecnología Química, Universitat Politècnica de València–Consejo Superior de Investigaciones Científicas, Avd. de los Naranjos s/n, 46022 Valencia, Spain; (U.D.); (A.E.P.)
| | - Lucjan Chmielarz
- Faculty of Chemistry, Jagiellonian University in Kraków, Gronostajowa 2, 30-387 Kraków, Poland; (A.Ś.); (M.R.); (A.K.)
- Correspondence:
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Dunn PL, Cook BJ, Johnson SI, Appel AM, Bullock RM. Oxidation of Ammonia with Molecular Complexes. J Am Chem Soc 2020; 142:17845-17858. [PMID: 32977718 DOI: 10.1021/jacs.0c08269] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Oxidation of ammonia by molecular complexes is a burgeoning area of research, with critical scientific challenges that must be addressed. A fundamental understanding of individual reaction steps is needed, particularly for cleavage of N-H bonds and formation of N-N bonds. This Perspective evaluates the challenges of designing molecular catalysts for oxidation of ammonia and highlights recent key contributions to realizing the goals of viable energy storage and retrieval based on the N-H bonds of ammonia in a carbon-free energy cycle.
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Affiliation(s)
- Peter L Dunn
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Brian J Cook
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Samantha I Johnson
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Aaron M Appel
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - R Morris Bullock
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
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Lin M, An B, Takei T, Shishido T, Ishida T, Haruta M, Murayama T. Features of Nb2O5 as a metal oxide support of Pt and Pd catalysts for selective catalytic oxidation of NH3 with high N2 selectivity. J Catal 2020. [DOI: 10.1016/j.jcat.2020.05.040] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Vikrant K, Kim KH, Dong F, Giannakoudakis DA. Photocatalytic Platforms for Removal of Ammonia from Gaseous and Aqueous Matrixes: Status and Challenges. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02163] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Kumar Vikrant
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea
| | - Ki-Hyun Kim
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea
| | - Fan Dong
- Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, China
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Ferrierite and Its Delaminated and Silica-Intercalated Forms Modified with Copper as Effective Catalysts for NH3-SCR Process. Catalysts 2020. [DOI: 10.3390/catal10070734] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The main goal of the study was the development of effective catalysts for the low-temperature selective catalytic reduction of NO with ammonia (NH3-SCR), based on ferrierite (FER) and its delaminated (ITQ-6) and silica-intercalated (ITQ-36) forms modified with copper. The copper exchange zeolitic samples, with the intended framework Si/Al ratio of 30 and 50, were synthetized and characterized with respect to their chemical composition (ICP-OES), structure (XRD), texture (low-temperature N2 adsorption), form and aggregation of deposited copper species (UV-vis-DRS), surface acidity (NH3-TPD) and reducibility (H2-TPR). The samples of the Cu-ITQ-6 and Cu-ITQ-36 series were found to be significantly more active NH3-SCR catalysts compared to Cu-FER. The activity of these catalysts in low-temperature NH3-SCR was assigned to the significant contribution of highly dispersed copper species (monomeric cations and small oligomeric species) catalytically active in the oxidation of NO to NO2, which is necessary for fast-SCR. The zeolitic catalysts, with the higher framework alumina content, were more effective in high-temperature NH3-SCR due to their limited catalytic activity in the side reaction of ammonia oxidation.
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49
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Jabłońska M. Progress on Selective Catalytic Ammonia Oxidation (NH
3
‐SCO) over Cu−Containing Zeolite‐Based Catalysts. ChemCatChem 2020. [DOI: 10.1002/cctc.202000649] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Magdalena Jabłońska
- Institute of Chemical Technology Universität Leipzig Linnéstr. 3 04103 Leipzig Germany
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50
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Borcuch A, Rutkowska M, Marzec A, Kowalczyk A, Michalik M, Moreno J, Díaz U, Chmielarz L. Selective ammonia oxidation over ZSM-5 zeolite: Impact of catalyst’s support porosity and type of deposited iron species. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.08.054] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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