1
|
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.
Collapse
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
| |
Collapse
|
2
|
Yao P, Li J, Pei M, Liu F, Xu H, Chen Y. Engineering a PtCu Alloy to Improve N 2 Selectivity of NH 3-SCO over the Pt/SSZ-13 Catalyst. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38477616 DOI: 10.1021/acsami.3c16747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/14/2024]
Abstract
Improving the N2 selectivity is always a great challenge for the selective catalytic oxidation of ammonia (NH3-SCO) over noble-metal-based (especially Pt) catalysts. In this work, Cu as an efficient promoter was introduced into the Pt/SSZ-13 catalyst to significantly improve the N2 selectivity of the NH3-SCO reaction. A PtCu alloy was formed in the PtCu/SSZ-13 catalyst, as confirmed by X-ray diffraction, transmission electron microscopy, energy dispersive spectrometry mapping, and X-ray absorption spectroscopy results. As indicated by the X-ray photoelectron spectroscopy analysis, the Pt species in the alloyed PtCu nanoparticle was mainly present in the electron-rich state on PtCu/SSZ-13, while the electron-deficient Cu and isolated Cu2+ species were both present on the surface of PtCu/SSZ-13. Due to such a unique alloyed structure with an altered oxidation state, the N2 selectivity of NH3-SCO on the PtCu/SSZ-13 catalyst was remarkably improved, while the NH3-SCO activity was kept comparable to that on Pt/SSZ-13. The reaction path was changed from the NH mechanism on Pt/SSZ-13 to both NH and internal selective catalytic reduction mechanisms on the PtCu/SSZ-13 catalyst, which was considered the main reason for the enhanced N2 selectivity. This work provides a new route to synthesize efficient alloy catalysts for optimizing the N2 selectivity of NH3-SCO for NH3 slip control in diesel exhaust purification.
Collapse
Affiliation(s)
- Pan Yao
- Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, Sichuan 610207, China
- Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), Nano Science Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States
| | - Jiayi Li
- Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, Sichuan 610207, China
- Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), Nano Science Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States
| | - Mingming Pei
- Sichuan Provincial Environmental Protection Environmental Catalytic Materials Engineering Technology Center, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
| | - Fudong Liu
- Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), Nano Science Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States
| | - Haidi Xu
- Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, Sichuan 610207, China
| | - Yaoqiang Chen
- Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, Sichuan 610207, China
- Sichuan Provincial Environmental Protection Environmental Catalytic Materials Engineering Technology Center, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
| |
Collapse
|
3
|
Chidunchi I, Kulikov M, Sаfarov R, Kopishev E. Extraction of platinum group metals from catalytic converters. Heliyon 2024; 10:e25283. [PMID: 38327460 PMCID: PMC10847661 DOI: 10.1016/j.heliyon.2024.e25283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2023] [Revised: 01/23/2024] [Accepted: 01/24/2024] [Indexed: 02/09/2024] Open
Abstract
Platinum group metals (PGMs) assume an important role within the chemistry and chemical engineering due to their exceptional chemical stability in high temperatures and various environmental conditions. Their unique attributes make them highly demanded materials across an array of industries. Nevertheless, the gradual depletion of PGM reserves underscores necessitates of recycling PGM-containing waste as a means to ensure the reasonable utilization of resources. Recycling of catalytic waste, in particular, presents a more cost-effective and environmentally sustainable approach acquiring these metals, in contrast to the conventional practice of mining from natural ores. Of particular importance are spent automotive catalysts, which represent a valuable source of platinum group metals, featuring substantially higher PGM concentrations than their naturally occurring counterparts. Conventionally, the recovering of PGMs from waste materials predominantly employs hydrometallurgical and pyrometallurgical processes. Unfortunately, these established techniques entail the utilization of potent oxidizing acidic solutions, including aqua regia and hydrochloric acid with chlorine gas, which exert adverse ecological consequences. In recent years, there has been a growing focus on the development of alternative methodologies that are both environmentally friendly and economically viable for the recovery of PGMs from spent catalysts. Notable among these emerging techniques are solvometallurgy, molecular recognition technology, and magnetic separation. This comprehensive review endeavors to study and assess the latest advancements in the recovery of platinum group metals from spent catalysts, meticulously evaluating their respective advantages and disadvantages. Through an analysis, this review aspires to identify the most promising method - one that combines environmental friendliness and economic feasibility.
Collapse
Affiliation(s)
| | - Maxim Kulikov
- L.N. Gumilyov Eurasian National University, Astana, 010000, Kazakhstan
| | - Ruslan Sаfarov
- L.N. Gumilyov Eurasian National University, Astana, 010000, Kazakhstan
| | - Eldar Kopishev
- L.N. Gumilyov Eurasian National University, Astana, 010000, Kazakhstan
- Bukhara State University, Bukhara, 200400, Uzbekistan
| |
Collapse
|
4
|
Tan W, Xie S, Zhang X, Ye K, Almousawi M, Kim D, Yu H, Cai Y, Xi H, Ma L, Ehrlich SN, Gao F, Dong L, Liu F. Fine-Tuning of Pt Dispersion on Al 2O 3 and Understanding the Nature of Active Pt Sites for Efficient CO and NH 3 Oxidation Reactions. ACS APPLIED MATERIALS & INTERFACES 2024; 16:454-466. [PMID: 38147632 DOI: 10.1021/acsami.3c11897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2023]
Abstract
Fine-tuning the dispersion of active metal species on widely used supports is a research hotspot in the catalysis community, which is vital for achieving a balance between the atomic utilization efficiency and the intrinsic activity of active sites. In this work, using bayerite Al(OH)3 as support directly or after precalcination at 200 or 550 °C, Pt/Al2O3 catalysts with distinct Pt dispersions from single atoms to clusters (ca. 2 nm) were prepared and evaluated for CO and NH3 removal. Richer surface hydroxyl groups on AlOx(OH)y support were proved to better facilitate the dispersion of Pt. However, Pt/Al2O3 with relatively lower Pt dispersion could exhibit better activity in CO/NH3 oxidation reactions. Further reaction mechanism study revealed that the Pt sites on Pt/Al2O3 with lower Pt dispersion could be activated to Pt0 species much easier under the CO oxidation condition, on which a higher CO adsorption capacity and more efficient O2 activation were achieved simultaneously. Compared to Pt single atoms, PtOx clusters could also better activate NH3 into -NH2 and -HNO species. The higher CO adsorption capacity and the more efficient NH3/O2 activation ability on Pt/Al2O3 with relatively lower Pt dispersion well explained its higher CO/NH3 oxidation activity. This study emphasizes the importance of avoiding a singular pursuit of single-atom catalyst synthesis and instead focusing on achieving the most effective Pt species on Al2O3 support for targeted reactions. This approach avoids unnecessary limitations and enables a more practical and efficient strategy for Pt catalyst fabrication in emission control applications.
Collapse
Affiliation(s)
- Wei Tan
- Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), NanoScience Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Shaohua Xie
- Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), NanoScience Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States
| | - Xing Zhang
- Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), NanoScience Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States
| | - Kailong Ye
- Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), NanoScience Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States
| | - Murtadha Almousawi
- Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), NanoScience Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States
| | - Daekun Kim
- Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), NanoScience Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States
| | - Haowei Yu
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Yandi Cai
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Hanchen Xi
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Lu Ma
- National Synchrotron Light Source II (NSLS-II), Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Steven N Ehrlich
- National Synchrotron Light Source II (NSLS-II), Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Fei Gao
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Lin Dong
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Fudong Liu
- Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), NanoScience Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States
| |
Collapse
|
5
|
Zhang Y, Wang M, Li Q, Zhang M, Liu C, Liu Q, Wang W, Zhang Z, Han R, Ji N. Regulating Electron Metal-Support Interaction to Suppress N 2O Formation in the Selective Catalytic Oxidation of Ammonia. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:895-905. [PMID: 38134359 DOI: 10.1021/acs.est.3c06691] [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: 12/24/2023]
Abstract
N2O is a common byproduct in the selective catalytic oxidation of ammonia, and its generation often needs to be inhibited due to its strong greenhouse effect. In this paper, using Ag/ZSO-Y as a model catalyst, the N2O selectivity was reduced by 30% through modulation of the electron metal-support interaction. The results demonstrate that the work function of the support can be regulated by the content of the doping element. As the Zr content increases in SnO2, the work function of the support decreases. Moreover, there is a positive correlation between the charge transfer amount and the work function of the support. A series of in situ DRIFTS and density functional theory calculations revealed that the -NO and -N reactions are the primary pathways for N2O formation. By adjustment of the work function of the support through varying the Zr doping level, the electronic structure of Ag NPs was further tuned, resulting in an increased reaction energy barrier for -NO and -N reactions, effectively suppressing N2O formation.
Collapse
Affiliation(s)
- Yan Zhang
- 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
| | - Meng Wang
- 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
| | - Qing Li
- 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
| | - Min Zhang
- 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
| | - 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
| | - Qingling 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
| | - Weichao Wang
- College of Electronic Information and Optical Engineering, Nankai 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
| | - Rui Han
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Na Ji
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| |
Collapse
|
6
|
Guan X, Asakura H, Han R, Xu S, Liu HX, Chen L, Yao Z, Yan JHC, Tanaka T, Guo Y, Jia CJ, Wang FR. Cascade NH 3 Oxidation and N 2O Decomposition via Bifunctional Co and Cu Catalysts. ACS Catal 2023; 13:13816-13827. [PMID: 37881788 PMCID: PMC10594585 DOI: 10.1021/acscatal.3c02392] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 09/25/2023] [Indexed: 10/27/2023]
Abstract
The selective catalytic oxidation of NH3 (NH3-SCO) to N2 is an important reaction for the treatment of diesel engine exhaust. Co3O4 has the highest activity among non-noble metals but suffers from N2O release. Such N2O emissions have recently been regulated due to having a 300× higher greenhouse gas effect than CO2. Here, we design CuO-supported Co3O4 as a cascade catalyst for the selective oxidation of NH3 to N2. The NH3-SCO reaction on CuO-Co3O4 follows a de-N2O pathway. Co3O4 activates gaseous oxygen to form N2O. The high redox property of the CuO-Co3O4 interface promotes the breaking of the N-O bond in N2O to form N2. The addition of CuO-Co3O4 to the Pt-Al2O3 catalyst reduces the full NH3 conversion temperature by 50 K and improves the N2 selectivity by 20%. These findings provide a promising strategy for reducing N2O emissions and will contribute to the rational design and development of non-noble metal catalysts.
Collapse
Affiliation(s)
- Xuze Guan
- Department
of Chemical Engineering, University College
London, Roberts Building, Torrington Place, London WC1E 7JE, U.K.
| | - Hiroyuki Asakura
- Department
of Applied Chemistry, Faculty of Science and Engineering, Kindai University 3-4-1, Kowakae, Higashiosaka, Osaka 577-8502, Japan
- Department
of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyotodaigaku Katsura, Nishikyo-ku, Kyoto, Kyoto 615-8510, Japan
| | - Rong Han
- School
of Electrical Engineering and Automation, Wuhan University, Wuhan, Hubei 430072, China
| | - Siyuan Xu
- School
of Electrical Engineering and Automation, Wuhan University, Wuhan, Hubei 430072, China
| | - Hao-Xin Liu
- Key
Laboratory for Colloid and Interface Chemistry, Key Laboratory of
Special Aggregated Materials, School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, China
| | - Lu Chen
- Department
of Chemical Engineering, University College
London, Roberts Building, Torrington Place, London WC1E 7JE, U.K.
| | - Zhangyi Yao
- Department
of Chemical Engineering, University College
London, Roberts Building, Torrington Place, London WC1E 7JE, U.K.
| | - Jay Hon Cheung Yan
- Department
of Chemical Engineering, University College
London, Roberts Building, Torrington Place, London WC1E 7JE, U.K.
| | - Tsunehiro Tanaka
- Department
of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyotodaigaku Katsura, Nishikyo-ku, Kyoto, Kyoto 615-8510, Japan
| | - Yuzheng Guo
- School
of Electrical Engineering and Automation, Wuhan University, Wuhan, Hubei 430072, China
| | - Chun-Jiang Jia
- Key
Laboratory for Colloid and Interface Chemistry, Key Laboratory of
Special Aggregated Materials, School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, China
| | - Feng Ryan Wang
- Department
of Chemical Engineering, University College
London, Roberts Building, Torrington Place, London WC1E 7JE, U.K.
| |
Collapse
|
7
|
Li YC, Li XS, Zhu B, Zhu X, Lian HY, Zhu AM. A facile approach to direct preparation of Pt nanocatalysts from oxidative dechloridation of supported H2PtCl6 by oxygen plasma. J Catal 2022. [DOI: 10.1016/j.jcat.2022.08.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
|
8
|
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
| |
Collapse
|
9
|
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.
Collapse
Affiliation(s)
- Magdalena Jabłońska
- Institute of Chemical Technology, Universität Leipzig, Linnéstr. 3, 04103 Leipzig, Germany
| |
Collapse
|
10
|
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]
|