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Park ED. Recent Progress on Low-Temperature Selective Catalytic Reduction of NO x with Ammonia. Molecules 2024; 29:4506. [PMID: 39339501 PMCID: PMC11434452 DOI: 10.3390/molecules29184506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2024] [Revised: 09/21/2024] [Accepted: 09/21/2024] [Indexed: 09/30/2024] Open
Abstract
Selective catalytic reduction of nitrogen oxides (NOx) with ammonia (NH3-SCR) has been implemented in response to the regulation of NOx emissions from stationary and mobile sources above 300 °C. However, the development of NH3-SCR catalysts active at low temperatures below 200 °C is still needed to improve the energy efficiency and to cope with various fuels. In this review article, recent reports on low-temperature NH3-SCR catalysts are systematically summarized. The redox property as well as the surface acidity are two main factors that affect the catalytic activity. The strong redox property is beneficial for the low-temperature NH3-SCR activity but is responsible for N2O formation. The multiple electron transfer system is more plausible for controlling redox properties. H2O and SOx, which are often found with NOx in flue gas, have a detrimental effect on NH3-SCR activity, especially at low temperatures. The competitive adsorption of H2O can be minimized by enhancing the hydrophobic property of the catalyst. Various strategies to improve the resistance to SOx poisoning are also discussed.
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Affiliation(s)
- Eun Duck Park
- Department of Energy Systems Research, Ajou University, Suwon 16499, Republic of Korea
- Department of Chemical Engineering, Ajou University, Suwon 16499, Republic of Korea
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2
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Zhu J, Muraoka K, Ohnishi T, Yanaba Y, Ogura M, Nakayama A, Wakihara T, Liu Z, Okubo T. Synthesis and Structural Analysis of High-Silica ERI Zeolite with Spatially-Biased Al Distribution as a Promising NH 3-SCR Catalyst. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2307674. [PMID: 38308139 PMCID: PMC11005726 DOI: 10.1002/advs.202307674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 01/05/2024] [Indexed: 02/04/2024]
Abstract
Erionite (ERI) zeolite has recently attracted considerable attention for its application prospect in the selective catalytic reduction of NOx with NH3 (NH3-SCR), provided that the high-silica (Si/Al > 5.5) analog with improved hydrothermal stability can be facilely synthesized. In this work, ERI zeolites with different Si/Al ratios (4.6, 6.4, and 9.1) are synthesized through an ultrafast route, and in particular, a high-silica ERI zeolite with a Si/Al ratio of 9.1 is obtained by using faujasite (FAU) as a starting material. The solid-state 29Si MAS NMR spectroscopic study in combination with a computational simulation allows for figuring out the atomic configurations of the Al species in the three ERI zeolites. It is revealed that the ERI zeolite with the highest Si/Al ratio (ERI-9.1, where the number indicates the Si/Al ratio) exhibits a biased Al occupancy at T1 site, which is possibly due to the presence of a higher fraction of the residual potassium cations in the can cages. In contrast, the Al siting in ERI-4.6 and ERI-6.4 proves to be relatively random.
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Affiliation(s)
- Jie Zhu
- Department of Chemical System EngineeringThe University of Tokyo7‐3‐1 HongoBunkyo‐kuTokyo113‐8656Japan
| | - Koki Muraoka
- Department of Chemical System EngineeringThe University of Tokyo7‐3‐1 HongoBunkyo‐kuTokyo113‐8656Japan
| | - Takeshi Ohnishi
- Institute of Industrial ScienceThe University of Tokyo4‐6‐1 KomabaMeguro‐kuTokyo153‐8505Japan
| | - Yutaka Yanaba
- Institute of Industrial ScienceThe University of Tokyo4‐6‐1 KomabaMeguro‐kuTokyo153‐8505Japan
| | - Masaru Ogura
- Institute of Industrial ScienceThe University of Tokyo4‐6‐1 KomabaMeguro‐kuTokyo153‐8505Japan
| | - Akira Nakayama
- Department of Chemical System EngineeringThe University of Tokyo7‐3‐1 HongoBunkyo‐kuTokyo113‐8656Japan
| | - Toru Wakihara
- Department of Chemical System EngineeringThe University of Tokyo7‐3‐1 HongoBunkyo‐kuTokyo113‐8656Japan
- Institute of Engineering InnovationThe University of Tokyo2‐11‐16 YayoiBunkyo‐kuTokyo113‐8656Japan
| | - Zhendong Liu
- Department of Chemical System EngineeringThe University of Tokyo7‐3‐1 HongoBunkyo‐kuTokyo113‐8656Japan
- Institute of Engineering InnovationThe University of Tokyo2‐11‐16 YayoiBunkyo‐kuTokyo113‐8656Japan
- State Key Laboratory of Chemical EngineeringDepartment of Chemical EngineeringTsinghua UniversityHaidian DistrictBeijing100084China
| | - Tatsuya Okubo
- Department of Chemical System EngineeringThe University of Tokyo7‐3‐1 HongoBunkyo‐kuTokyo113‐8656Japan
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Han J, Li J, Zhao W, Li L, Chen M, Ge X, Wang S, Liu Q, Mei D, Yu J. Cu-OFF/ERI Zeolite: Intergrowth Structure Synergistically Boosting Selective Catalytic Reduction of NO x with NH 3. J Am Chem Soc 2024; 146:7605-7615. [PMID: 38467427 DOI: 10.1021/jacs.3c13855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/13/2024]
Abstract
Cu-SSZ-13 has been commercialized for selective catalytic reduction with ammonia (NH3-SCR) to remove NOx from diesel exhaust. As its synthesis usually requires toxic and costly organic templates, the discovery of alternative Cu-based zeolite catalysts with organotemplate-free synthesis and comparable or even superior NH3-SCR activity to that of Cu-SSZ-13 is of great academic and industrial significance. Herein, we demonstrated that Cu-T with an intergrowth structure of offretite (OFF) and erionite (ERI) synthesized by an organotemplate-free method showed better catalytic performance than Cu-ERI and Cu-OFF as well as Cu-SSZ-13. Structure characterizations and density functional theory calculations indicated that the intergrowth structure promoted more isolated Cu2+ located at the 6MR of the intergrowth interface, resulting in a better hydrothermal stability of Cu-T than Cu-ERI and Cu-OFF. Strikingly, the low-temperature activity of Cu-T significantly increased after hydrothermal aging, while that of Cu-ERI and Cu-OFF substantially decreased. Based on in situ diffuse reflectance infrared Fourier transform spectra analysis and density functional theory calculations, the reason can be attributed to the fact that NH4NO3 formed on the CuxOy species within ERI polymorph of Cu-T underwent a fast SCR reaction pathway with the assistance of Brønsted acid sites at the intergrowth interfaces under standard SCR reaction conditions. Significantly, Cu-T exhibited a wider temperature window at a catalytic activity of over 90% than Cu-SSZ-13 (175-550 vs 175-500 °C for fresh and 225-500 vs 250-400 °C for hydrothermal treatment). This work provides a new direction for the design of high-performance NH3-SCR catalysts in terms of the interplay of the intergrowth structure of zeolites.
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Affiliation(s)
- Jinfeng Han
- Tianjin Key Lab of Indoor Air Environmental Quality Control, School of Environmental Science and Technology, Tianjin University, Tianjin 300350, P. R. China
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
- State Key Laboratory of Engines, Tianjin University, Tianjin 300350, P. R. China
| | - Junyan Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
- Center for High-Resolution Electron Microscopy (CℏEM), School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, P. R. China
| | - Wenru Zhao
- School of Materials Science and Engineering, Tiangong University, Tianjin 300387, P. R. China
| | - Lin Li
- Electron Microscopy Center, Jilin University, Changchun 130012, P. R. China
| | - Mengyang Chen
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
- International Center of Future Science, Jilin University, Changchun 130012, P. R. China
| | - Xin Ge
- Electron Microscopy Center, Jilin University, Changchun 130012, P. R. China
| | - Sen Wang
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China
| | - Qingling Liu
- Tianjin Key Lab of Indoor Air Environmental Quality Control, School of Environmental Science and Technology, Tianjin University, Tianjin 300350, P. R. China
- State Key Laboratory of Engines, Tianjin University, Tianjin 300350, P. R. China
| | - Donghai Mei
- School of Materials Science and Engineering, Tiangong University, Tianjin 300387, P. R. China
| | - Jihong Yu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
- International Center of Future Science, Jilin University, Changchun 130012, P. R. China
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4
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Wu Y, Zhao W, Ahn SH, Wang Y, Walter ED, Chen Y, Derewinski MA, Washton NM, Rappé KG, Wang Y, Mei D, Hong SB, Gao F. Interplay between copper redox and transfer and support acidity and topology in low temperature NH 3-SCR. Nat Commun 2023; 14:2633. [PMID: 37149681 PMCID: PMC10164144 DOI: 10.1038/s41467-023-38309-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 04/25/2023] [Indexed: 05/08/2023] Open
Abstract
Low-temperature standard NH3-SCR over copper-exchanged zeolite catalysts occurs on NH3-solvated Cu-ion active sites in a quasi-homogeneous manner. As key kinetically relevant reaction steps, the reaction intermediate CuII(NH3)4 ion hydrolyzes to CuII(OH)(NH3)3 ion to gain redox activity. The CuII(OH)(NH3)3 ion also transfers between neighboring zeolite cages to form highly reactive reaction intermediates. Via operando electron paramagnetic resonance spectroscopy and SCR kinetic measurements and density functional theory calculations, we demonstrate here that such kinetically relevant steps become energetically more difficult with lower support Brønsted acid strength and density. Consequently, Cu/LTA displays lower Cu atomic efficiency than Cu/CHA and Cu/AEI, which can also be rationalized by considering differences in their support topology. By carrying out hydrothermal aging to eliminate support Brønsted acid sites, both CuII(NH3)4 ion hydrolysis and CuII(OH)(NH3)3 ion migration are hindered, leading to a marked decrease in Cu atomic efficiency for all catalysts.
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Affiliation(s)
- Yiqing Wu
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA, 99354, US
| | - Wenru Zhao
- School of Materials Science and Engineering, Tiangong University, Tianjin, 300387, China
| | - Sang Hyun Ahn
- Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH, Pohang, 37673, Republic of Korea
| | - Yilin Wang
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA, 99354, US
| | - Eric D Walter
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA, 99354, US
| | - Ying Chen
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA, 99354, US
| | - Miroslaw A Derewinski
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA, 99354, US
- J. Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, 30-239, Krakow, Poland
| | - Nancy M Washton
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA, 99354, US
| | - Kenneth G Rappé
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA, 99354, US
| | - Yong Wang
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA, 99354, US
- Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA, 99163, US
| | - Donghai Mei
- School of Materials Science and Engineering, Tiangong University, Tianjin, 300387, China.
- School of Environmental Science and Engineering, Tiangong University, Tianjin, 300387, China.
| | - Suk Bong Hong
- Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH, Pohang, 37673, Republic of Korea.
| | - Feng Gao
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA, 99354, US.
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Liu Z, Shan Y, Han S, Fu Y, Du J, Sun Y, Shi X, Yu Y, He H. Insights into SO 2 Poisoning Mechanisms of Fresh and Hydrothermally Aged Cu-KFI Catalysts for NH 3-SCR Reaction. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:4308-4317. [PMID: 36808994 DOI: 10.1021/acs.est.2c09805] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The complex poisoning of Cu-KFI catalysts by SO2 and hydrothermal aging (HTA) was investigated. The low-temperature activity of Cu-KFI catalysts was restrained by the formation of H2SO4 and then CuSO4 after sulfur poisoning. Hydrothermally aged Cu-KFI exhibited better SO2 resistance than fresh Cu-KFI since HTA significantly reduced the number of Brønsted acid sites, which were considered to be the H2SO4 storage sites. The high-temperature activity of SO2-poisoned Cu-KFI was basically unchanged compared to the fresh catalyst. However, SO2 poisoning promoted the high-temperature activity of hydrothermally aged Cu-KFI since it triggered CuOx into CuSO4 species, which was considered as an important role in the NH3-SCR reaction at high temperatures. In addition, hydrothermally aged Cu-KFI catalysts were more easily regenerated after SO2 poisoning than fresh Cu-KFI on account of the instability of CuSO4.
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Affiliation(s)
- Zhongqi Liu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yulong Shan
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shichao Han
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Yu Fu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jinpeng Du
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Yu Sun
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, 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
- 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
- University of Chinese Academy of Sciences, Beijing 100049, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, 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
- University of Chinese Academy of Sciences, Beijing 100049, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
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6
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Li Y, Chen D, Xu X, Wang X, Kang R, Fu M, Guo Y, Chen P, Li Y, Ye D. Cold-Start NO x Mitigation by Passive Adsorption Using Pd-Exchanged Zeolites: From Material Design to Mechanism Understanding and System Integration. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:3467-3485. [PMID: 36802541 DOI: 10.1021/acs.est.2c06207] [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: 06/18/2023]
Abstract
It remains a major challenge to abate efficiently the harmful nitrogen oxides (NOx) in low-temperature diesel exhausts emitted during the cold-start period of engine operation. Passive NOx adsorbers (PNA), which could temporarily capture NOx at low temperatures (below 200 °C) and release the stored NOx at higher temperatures (normally 250-450 °C) to downstream selective catalytic reduction unit for complete abatement, hold promise to mitigate cold-start NOx emissions. In this review, recent advances in material design, mechanism understanding, and system integration are summarized for PNA based on palladium-exchanged zeolites. First, we discuss the choices of parent zeolite, Pd precursor, and synthetic method for the synthesis of Pd-zeolites with atomic Pd dispersions, and review the effect of hydrothermal aging on the properties and PNA performance of Pd-zeolites. Then, we show how different experimental and theoretical methodologies can be integrated to gain mechanistic insights into the nature of Pd active sites, the NOx storage/release chemistry, as well as the interactions between Pd and typical components/poisons in engine exhausts. This review also gathers several novel designs of PNA integration into modern exhaust after-treatment systems for practical application. At the end, we discuss the major challenges, as well as important implications, for the further development and real application of Pd-zeolite-based PNA in cold-start NOx mitigation.
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Affiliation(s)
- Ying Li
- National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
| | - Dongdong Chen
- National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
| | - Xin Xu
- National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
| | - Xinyu Wang
- National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
| | - Running Kang
- Department of Chemical and Metallurgical Engineering, School of Chemical Engineering, Aalto University, 02150 Espoo, Finland
| | - Mingli Fu
- National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
| | - Yanbing Guo
- Institute of Environmental and Applied Chemistry, College of Chemistry, Central China Normal University, 430079 Wuhan, China
| | - Peirong Chen
- National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
| | - Yongdan Li
- Department of Chemical and Metallurgical Engineering, School of Chemical Engineering, Aalto University, 02150 Espoo, Finland
| | - Daiqi Ye
- National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
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Li J, Gao M, Yan W, Yu J. Regulation of the Si/Al ratios and Al distributions of zeolites and their impact on properties. Chem Sci 2023; 14:1935-1959. [PMID: 36845940 PMCID: PMC9945477 DOI: 10.1039/d2sc06010h] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 12/27/2022] [Indexed: 12/29/2022] Open
Abstract
Zeolites are typically a class of crystalline microporous aluminosilicates that are constructed by SiO4 and AlO4 tetrahedra. Because of their unique porous structures, strong Brönsted acidity, molecular-level shape selectivity, exchangeable cations, and high thermal/hydrothermal stability, zeolites are widely used as catalysts, adsorbents, and ion-exchangers in industry. The activity, selectivity, and stability/durability of zeolites in applications are closely related to their Si/Al ratios and Al distributions in the framework. In this review, we discussed the basic principles and the state-of-the-art methodologies for regulating the Si/Al ratios and Al distributions of zeolites, including seed-assisted recipe modification, interzeolite transformation, fluoride media, and usage of organic structure-directing agents (OSDAs), etc. The conventional and newly developed characterization methods for determining the Si/Al ratios and Al distributions were summarized, which include X-ray fluorescence spectroscopy (XRF), solid state 29Si/27Al magic-angle-spinning nuclear magnetic resonance spectroscopy (29Si/27Al MAS NMR), Fourier-transform infrared spectroscopy (FT-IR), etc. The impact of Si/Al ratios and Al distributions on the catalysis, adsorption/separation, and ion-exchange performance of zeolites were subsequently demonstrated. Finally, we presented a perspective on the precise control of the Si/Al ratios and Al distributions of zeolites and the corresponding challenges.
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Affiliation(s)
- Jialiang Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University 2699 Qianjin Street Changchun 130012 China
| | - Mingkun Gao
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University 2699 Qianjin Street Changchun 130012 China
| | - Wenfu Yan
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University 2699 Qianjin Street Changchun 130012 China
| | - Jihong Yu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University 2699 Qianjin Street Changchun 130012 China
- International Center of Future Science, Jilin University 2699 Qianjin Street Changchun 130012 China
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Luo J, Xu H, Liang X, Wu S, Liu Z, Tie Y, Li M, Yang D. Research progress on selective catalytic reduction of NOx by NH3 over copper zeolite catalysts at low temperature: reaction mechanism and catalyst deactivation. RESEARCH ON CHEMICAL INTERMEDIATES 2022. [DOI: 10.1007/s11164-022-04938-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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9
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Sun Y, Fu Y, Shan Y, Du J, Liu Z, Gao M, Shi X, He G, Xue S, Han X, Yu Y, He H. Si/Al Ratio Determines the SCR Performance of Cu-SSZ-13 Catalysts in the Presence of NO 2. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:17946-17954. [PMID: 36322164 DOI: 10.1021/acs.est.2c03813] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
A comparative study was performed to investigate the NH3-selective catalytic reduction (SCR) reaction activity of Cu-SSZ-13 zeolites having Si/Al ratios (SARs) of 5, 18, and 30. Remarkably, the Cu-SSZ-13 zeolite catalysts exhibited completely opposite behaviors as a function of SAR under standard SCR (SSCR) and fast SCR (FSCR) reaction atmospheres. Under SSCR conditions, the NOx conversion increased as expected with the decreasing SAR. Under FSCR conditions, however, the NOx conversion decreased as the SAR decreased, contrary to expectations. In this study, based on characterization of the catalysts by X-ray diffraction, transmission electron microscopy, electron paramagnetic resonance, H2-temperature-programmed reduction, temperature-programmed desorption, and diffuse reflectance infrared Fourier transform spectroscopy, together with theoretical calculations, the authors found that the amount of Brønsted acid sites goes up while the SAR goes down, leading to an increase in the accumulation of NH4NO3 under FSCR reaction conditions. Moreover, the accumulated NH4NO3 is of greater stability for those low SAR Cu-SSZ-13 catalysts. These two reasons cause the FSCR performance of Cu-SSZ-13 to decrease with a decrease in SAR. As a result, the NO2 effect on SCR activity changes from promotion to inhibition as the SAR decreases.
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Affiliation(s)
- Yu Sun
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing100085, China
- University of Chinese Academy of Sciences, Beijing100049, China
| | - Yu Fu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing100085, China
- University of Chinese Academy of Sciences, Beijing100049, China
| | - Yulong Shan
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing100085, China
| | - Jinpeng Du
- Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen361021, China
| | - Zhongqi Liu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing100085, China
- University of Chinese Academy of Sciences, Beijing100049, China
| | - Meng Gao
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing100085, China
- University of Chinese Academy of Sciences, Beijing100049, China
| | - Xiaoyan Shi
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing100085, China
- University of Chinese Academy of Sciences, Beijing100049, China
| | - Guangzhi He
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing100085, China
| | - Sen Xue
- Weichai Power Co., Ltd., Weifang261061, China
| | - Xuewang Han
- Weichai Power Co., Ltd., Weifang261061, China
| | - Yunbo Yu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing100085, China
- University of Chinese Academy of Sciences, Beijing100049, China
- Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen361021, China
| | - Hong He
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing100085, China
- University of Chinese Academy of Sciences, Beijing100049, China
- Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen361021, China
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10
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Ma Y, Gao Y, Wu X, Jin B, Ran R, Si Z, Weng D. Destructive and Protective Effects of NH 3 on the Low-Temperature Hydrothermal Stability of SAPO-34 and Cu-SAPO-34. ACS APPLIED MATERIALS & INTERFACES 2022; 14:43442-43455. [PMID: 36106798 DOI: 10.1021/acsami.2c13890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The influences of gaseous, weakly adsorbed, and strongly adsorbed NH3 on the low-temperature (<100 °C) hydrothermal stability of SAPO-34 and Cu-SAPO-34 were investigated. NH3 temperature-programmed desorption (NH3-TPD), 1H magic angle spinning nuclear magnetic resonance (MAS NMR), and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) were adopted to characterize the adsorption states of NH3 and H2O in SAPO-34, and the destruction of the SAPO-34 framework was revealed by direct and cross-polarization 29Si, 27Al, and 31P MAS NMR. Gaseous NH3 coadsorbed with H2O inside SAPO-34 micropores and induced the hydrolysis of framework P-O-Al and Si-O(H)-Al bonds. Weakly adsorbed NH3 was released during aging and played a similar negative role to gaseous NH3. When being combined with hydrolyzed Al species from the framework, active Cu ions transformed to inactive CuAl2O4-like species, leading to deactivation in low-temperature SCR of Cu-SAPO-34. Strongly adsorbed NH4+ via 200 °C preadsorption protected the framework integrity of SAPO-34 and the SCR activity of Cu-SAPO-34.
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Affiliation(s)
- Yue Ma
- The Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Yang Gao
- The Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Xiaodong Wu
- The Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Baofang Jin
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Rui Ran
- The Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Zhichun Si
- Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
| | - Duan Weng
- The Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
- Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
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11
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Liu Y, Yang D, Shang J, Zhou J, Chang V. Direct decomposition of NO over 8MR in high silica Cu-LTA zeolite: A DFT study on reaction mechanisms, thermodynamics and kinetics. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Hoffmann A, De Prins M, Sree SP, Vanbutsele G, Smet S, Chandran CV, Radhakrishnan S, Breynaert E, Martens JA. Selective catalytic reduction of NO x with ammonia (NH 3-SCR) over copper loaded LEV type zeolites synthesized with different templates. Phys Chem Chem Phys 2022; 24:15428-15438. [PMID: 35708199 DOI: 10.1039/d2cp01512a] [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
LEV type zeolites were synthesized with four different structure-directing agents and converted to copper loaded NH3-SCR catalysts. The synthesis recipe was found to impact the respective Al population in the two topologically different framework sites in double and single 6-rings, resolvable by 27Al MAS NMR spectroscopy. Hydrothermal stability was found to be related to the silanol concentration, Si/Al ratio, particle size, crystal morphology, crystal defects, external surface area, and microporosity. Catalytic activity in NH3-SCR was dependent on preferential Al siting in the double 6-rings. Levinite synthesized using adamantylamine showed the strongest preference for Al atoms sitting in double 6-ring sites, and showed the highest catalytic turnover frequency. Unfortunately, because of the large crystal size, copper loading of this sample was limited to 0.6 wt% while other samples could be loaded with copper up to 3.3 wt%. An optimum combination of hydrothermal stability and catalytic activity was obtained with N,N'-bis-dimethylpentanediyldiammonium dibromide as structure-directing agent.
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Affiliation(s)
- Andreas Hoffmann
- Center for Surface Chemistry and Catalysis: Characterization and Application Team, KU Leuven, Celestijnenlaan 200F, Box 2461, 3001 Heverlee, Leuven, Belgium.
| | - Michiel De Prins
- Center for Surface Chemistry and Catalysis: Characterization and Application Team, KU Leuven, Celestijnenlaan 200F, Box 2461, 3001 Heverlee, Leuven, Belgium.
| | - Sreeprasanth Pulinthanathu Sree
- Center for Surface Chemistry and Catalysis: Characterization and Application Team, KU Leuven, Celestijnenlaan 200F, Box 2461, 3001 Heverlee, Leuven, Belgium.
| | - Gina Vanbutsele
- Center for Surface Chemistry and Catalysis: Characterization and Application Team, KU Leuven, Celestijnenlaan 200F, Box 2461, 3001 Heverlee, Leuven, Belgium.
| | - Sam Smet
- Center for Surface Chemistry and Catalysis: Characterization and Application Team, KU Leuven, Celestijnenlaan 200F, Box 2461, 3001 Heverlee, Leuven, Belgium.
| | - C Vinod Chandran
- Center for Surface Chemistry and Catalysis: Characterization and Application Team, KU Leuven, Celestijnenlaan 200F, Box 2461, 3001 Heverlee, Leuven, Belgium.
| | - Sambhu Radhakrishnan
- Center for Surface Chemistry and Catalysis: Characterization and Application Team, KU Leuven, Celestijnenlaan 200F, Box 2461, 3001 Heverlee, Leuven, Belgium.
| | - Eric Breynaert
- Center for Surface Chemistry and Catalysis: Characterization and Application Team, KU Leuven, Celestijnenlaan 200F, Box 2461, 3001 Heverlee, Leuven, Belgium.
| | - Johan A Martens
- Center for Surface Chemistry and Catalysis: Characterization and Application Team, KU Leuven, Celestijnenlaan 200F, Box 2461, 3001 Heverlee, Leuven, Belgium.
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13
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Direct synthesis of aluminosilicate ITH zeolite in the presence of a small organic template. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.04.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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14
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Xu G, Li H, Yu Y, He H. Dynamic Change of Active Sites of Supported Vanadia Catalysts for Selective Catalytic Reduction of Nitrogen Oxides. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:3710-3718. [PMID: 35195409 DOI: 10.1021/acs.est.1c07739] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Selective catalytic reduction of NOx by ammonia (NH3-SCR) on V2O5/TiO2 catalysts is a widely used commercial technology in power plants and diesel vehicles due to its high elimination efficiency for NOx removal. However, the mechanistic aspects of the NH3-SCR reaction, especially the active sites on the V2O5/TiO2 catalysts, are still a puzzle. Herein, using combined operando spectroscopy and density functional theory calculations, we found that the reactivity of the Lewis acid site was significantly overestimated due to its conversion to the Brønsted acid site. Such interconversion makes it challenging to measure the intrinsic reactivity of different acid sites accurately. In contrast, the abundant V-OH Brønsted acid sites govern the overall NOx reduction rate in realistic exhaust containing water vapor. Moreover, the vanadia species cycle between V5+═O and V4+-OH during NOx reduction, and the re-oxidation of V4+ species to form V5+ is the rate-determining step.
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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
| | - Hao Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, 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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15
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Shan Y, Du J, Zhang Y, Shan W, Shi X, Yu Y, Zhang R, Meng X, Xiao FS, He H. Selective catalytic reduction of NO x with NH 3: opportunities and challenges of Cu-based small-pore zeolites. Natl Sci Rev 2021; 8:nwab010. [PMID: 34858603 PMCID: PMC8566184 DOI: 10.1093/nsr/nwab010] [Citation(s) in RCA: 55] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 12/28/2020] [Accepted: 01/11/2021] [Indexed: 11/13/2022] Open
Abstract
Zeolites, as efficient and stable catalysts, are widely used in the environmental catalysis field. Typically, Cu-SSZ-13 with small-pore structure shows excellent catalytic activity for selective catalytic reduction of NO x with ammonia (NH3-SCR) as well as high hydrothermal stability. This review summarizes major advances in Cu-SSZ-13 applied to the NH3-SCR reaction, including the state of copper species, standard and fast SCR reaction mechanism, hydrothermal deactivation mechanism, poisoning resistance and synthetic methodology. The review gives a valuable summary of new insights into the matching between SCR catalyst design principles and the characteristics of Cu2+-exchanged zeolitic catalysts, highlighting the significant opportunity presented by zeolite-based catalysts. Principles for designing zeolites with excellent NH3-SCR performance and hydrothermal stability are proposed. On the basis of these principles, more hydrothermally stable Cu-AEI and Cu-LTA zeolites are elaborated as well as other alternative zeolites applied to NH3-SCR. Finally, we call attention to the challenges facing Cu-based small-pore zeolites that still need to be addressed.
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Affiliation(s)
- Yulong Shan
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Jinpeng Du
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Yan Zhang
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Wenpo Shan
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, 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
| | - 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
| | - Runduo Zhang
- State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Energy Environmental Catalysis, Beijing University of Chemical Technology, Beijing 100029, China
| | - Xiangju Meng
- Key Laboratory of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou 310007, China
| | - Feng-Shou Xiao
- Key Laboratory of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou 310007, 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
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16
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Sun Q, Wang N, Yu J. Advances in Catalytic Applications of Zeolite-Supported Metal Catalysts. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2104442. [PMID: 34611941 DOI: 10.1002/adma.202104442] [Citation(s) in RCA: 60] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 07/15/2021] [Indexed: 06/13/2023]
Abstract
Zeolites possessing large specific surface areas, ordered micropores, and adjustable acidity/basicity have emerged as ideal supports to immobilize metal species with small sizes and high dispersities. In recent years, the zeolite-supported metal catalysts have been widely used in diverse catalytic processes, showing excellent activity, superior thermal/hydrothermal stability, and unique shape-selectivity. In this review, a comprehensive summary of the state-of-the-art achievements in catalytic applications of zeolite-supported metal catalysts are presented for important heterogeneous catalytic processes in the last five years, mainly including 1) the hydrogenation reactions (e.g., CO/CO2 hydrogenation, hydrogenation of unsaturated compounds, and hydrogenation of nitrogenous compounds); 2) dehydrogenation reactions (e.g., alkane dehydrogenation and dehydrogenation of chemical hydrogen storage materials); 3) oxidation reactions (e.g., CO oxidation, methane oxidation, and alkene epoxidation); and 4) other reactions (e.g., hydroisomerization reaction and selective catalytic reduction of NOx with ammonia reaction). Finally, some current limitations and future perspectives on the challenge and opportunity for this subject are pointed out. It is believed that this review will inspire more innovative research on the synthesis and catalysis of zeolite-supported metal catalysts and promote their future developments to meet the emerging demands for practical applications.
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Affiliation(s)
- Qiming Sun
- Innovation Center for Chemical Sciences|College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China
| | - Ning Wang
- College of Chemistry and Chemical Engineering, Qingdao University, Shandong, 266071, P. R. China
| | - Jihong Yu
- Innovation Center for Chemical Sciences|College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
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17
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Han J, Liu C, Liu Q, Lu S, Bi Y, Wang X, Guo M, Song C, Ji N, Lu X, Ma D, Li Z. Cu-exchanged Al-rich OFF-CHA twin-crystal zeolite for the selective catalytic reduction of NOx by NH3. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.07.082] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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18
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19
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Datye AK, Votsmeier M. Opportunities and challenges in the development of advanced materials for emission control catalysts. NATURE MATERIALS 2021; 20:1049-1059. [PMID: 33020611 DOI: 10.1038/s41563-020-00805-3] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 08/18/2020] [Indexed: 06/11/2023]
Abstract
Advances in engine technologies are placing additional demands on emission control catalysts, which must now perform at lower temperatures, but at the same time be robust enough to survive harsh conditions encountered in engine exhaust. In this Review, we explore some of the materials concepts that could revolutionize the technology of emission control systems. These include single-atom catalysts, two-dimensional materials, three-dimensional architectures, core@shell nanoparticles derived via atomic layer deposition and via colloidal synthesis methods, and microporous oxides. While these materials provide enhanced performance, they will need to overcome many challenges before they can be deployed for treating exhaust from cars and trucks. We assess the state of the art for catalysing reactions related to emission control and also consider radical breakthroughs that could potentially completely transform this field.
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Affiliation(s)
- Abhaya K Datye
- Department of Chemical and Biological Engineering, University of New Mexico, Albuquerque, NM, USA.
| | - Martin Votsmeier
- Technical University of Darmstadt, Darmstadt, Germany.
- Umicore AG & Co. KG, Hanau, Germany.
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20
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Simancas R, Chokkalingam A, Elangovan SP, Liu Z, Sano T, Iyoki K, Wakihara T, Okubo T. Recent progress in the improvement of hydrothermal stability of zeolites. Chem Sci 2021; 12:7677-7695. [PMID: 34168820 PMCID: PMC8188473 DOI: 10.1039/d1sc01179k] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 04/27/2021] [Indexed: 01/14/2023] Open
Abstract
Zeolites have been successfully employed in many catalytic reactions of industrial relevance. The severe conditions required in some processes, where high temperatures are frequently combined with the presence of steam, highlight the need of considering the evolution of the catalyst structure during the reaction. This review attempts to summarize the recently developed strategies to improve the hydrothermal framework stability of zeolites.
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Affiliation(s)
- Raquel Simancas
- Department of Chemical System Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 13-8656 Japan
| | - Anand Chokkalingam
- Department of Chemical System Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 13-8656 Japan
| | - Shanmugam P Elangovan
- Department of Chemical System Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 13-8656 Japan
| | - Zhendong Liu
- Department of Chemical System Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 13-8656 Japan
- Institute of Engineering Innovation, The University of Tokyo 2-11-16 Yayoi, Bunkyo-ku Tokyo 113-8656 Japan
| | - Tsuneji Sano
- Department of Chemical System Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 13-8656 Japan
| | - Kenta Iyoki
- Department of Chemical System Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 13-8656 Japan
| | - Toru Wakihara
- Department of Chemical System Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 13-8656 Japan
- Institute of Engineering Innovation, The University of Tokyo 2-11-16 Yayoi, Bunkyo-ku Tokyo 113-8656 Japan
| | - Tatsuya Okubo
- Department of Chemical System Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 13-8656 Japan
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21
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Ohata Y, Ohnishi T, Moteki T, Ogura M. High NH 3-SCR reaction rate with low dependence on O 2 partial pressure over Al-rich Cu-*BEA zeolite. RSC Adv 2021; 11:10381-10384. [PMID: 35423523 PMCID: PMC8695709 DOI: 10.1039/d1ra00943e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Accepted: 03/05/2021] [Indexed: 11/21/2022] Open
Abstract
Dependence of NH3-SCR reaction rate on O2 partial pressure was investigated at 473 K over Cu ion-exchanged MOR, MFI, CHA and *BEA zeolites with varying “Cu density in micropores”. Among the zeolites, Cu–*BEA zeolite demonstrated promising potential as an effective catalyst for NH3-SCR over a wide range of O2 partial pressure. It was revealed that Al-rich Cu–*BEA zeolite exhibit high reaction rate for NH3-SCR at 473 K in low PO2 reaction condition.![]()
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Affiliation(s)
- Yusuke Ohata
- Institute of Industrial Science, The University of Tokyo Komaba, Meguro Tokyo 153-8505 Japan
| | - Takeshi Ohnishi
- Institute of Industrial Science, The University of Tokyo Komaba, Meguro Tokyo 153-8505 Japan
| | - Takahiko Moteki
- Institute of Industrial Science, The University of Tokyo Komaba, Meguro Tokyo 153-8505 Japan .,Elements Strategy Initiative for Catalysts and Batteries, Kyoto University Katsura Kyoto 615-8520 Japan
| | - Masaru Ogura
- Institute of Industrial Science, The University of Tokyo Komaba, Meguro Tokyo 153-8505 Japan .,Elements Strategy Initiative for Catalysts and Batteries, Kyoto University Katsura Kyoto 615-8520 Japan
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22
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Ohata Y, Kubota H, Toyao T, Shimizu KI, Ohnishi T, Moteki T, Ogura M. Kinetic and spectroscopic insights into the behaviour of Cu active site for NH 3-SCR over zeolites with several topologies. Catal Sci Technol 2021. [DOI: 10.1039/d0cy01838d] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Zeolite topology has a great effect on the dependence of NH3-SCR rates over Cu–zeolites at 473 K on Cu density. It is revealed by the time-resolved UV-vis measurements that zeolites mainly affect the oxidation property of Cu ion by O2.
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Affiliation(s)
- Yusuke Ohata
- Institute of Industrial Science
- The University of Tokyo
- Tokyo 153-8505
- Japan
| | - Hiroe Kubota
- Institute for Catalysis
- Hokkaido University
- Sapporo 001-0021
- Japan
| | - Takashi Toyao
- Institute for Catalysis
- Hokkaido University
- Sapporo 001-0021
- Japan
- Elements Strategy Initiative for Catalysts and Batteries
| | - Ken-ichi Shimizu
- Institute for Catalysis
- Hokkaido University
- Sapporo 001-0021
- Japan
- Elements Strategy Initiative for Catalysts and Batteries
| | - Takeshi Ohnishi
- Institute of Industrial Science
- The University of Tokyo
- Tokyo 153-8505
- Japan
| | - Takahiko Moteki
- Institute of Industrial Science
- The University of Tokyo
- Tokyo 153-8505
- Japan
- Elements Strategy Initiative for Catalysts and Batteries
| | - Masaru Ogura
- Institute of Industrial Science
- The University of Tokyo
- Tokyo 153-8505
- Japan
- Elements Strategy Initiative for Catalysts and Batteries
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23
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In situ imaging of two-dimensional surface growth reveals the prevalence and role of defects in zeolite crystallization. Proc Natl Acad Sci U S A 2020; 117:28632-28639. [PMID: 33127756 DOI: 10.1073/pnas.2011806117] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Zeolite crystallization predominantly occurs by nonclassical pathways involving the attachment of complex (alumino)silicate precursors to crystal surfaces, yet recurrent images of fully crystalline materials with layered surfaces are evidence of classical growth by molecule attachment. Here we use in situ atomic force microscopy to monitor three distinct mechanisms of two-dimensional (2D) growth of zeolite A where we show that layer nucleation from surface defects is the most common pathway. Direct observation of defects was made possible by the identification of conditions promoting layered growth, which correlates to the use of sodium as an inorganic structure-directing agent, whereas its replacement with an organic results in a nonclassical mode of growth that obscures 2D layers and markedly slows the rate of crystallization. In situ measurements of layered growth reveal that undissolved silica nanoparticles in the synthesis medium can incorporate into advancing steps on crystal surfaces to generate defects (i.e., amorphous silica occlusions) that largely go undetected in literature. Nanoparticle occlusion in natural and synthetic crystals is a topic of wide-ranging interest owing to its relevance in fields spanning from biomineralization to the rational design of functional nanocomposites. In this study, we provide unprecedented insight into zeolite surface growth by molecule addition through time-resolved microscopy that directly captures the occlusion of silica nanoparticles and highlights the prevalent role of defects in zeolite crystallization.
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Fe-Exchanged Small-Pore Zeolites as Ammonia Selective Catalytic Reduction (NH3-SCR) Catalysts. Catalysts 2020. [DOI: 10.3390/catal10111324] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Cu-exchanged small-pore zeolites have been extensively studied in the past decade as state-of-the-art selective catalytic reduction (SCR) catalysts for diesel engine exhaust NOx abatement for the transportation industry. During this time, Fe-exchanged small-pore zeolites, e.g., Fe/SSZ-13, Fe/SAPO-34, Fe/SSZ-39 and high-silica Fe/LTA, have also been investigated but much less extensively. In comparison to their Cu-exchanged counterparts, such Fe/zeolite catalysts display inferior low-temperature activities, but improved stability and high-temperature SCR selectivities. Such characteristics entitle these catalysts to be considered as key components of highly efficient emission control systems to improve the overall catalyst performance. In this short review, recent studies on Fe-exchanged small-pore zeolite SCR catalysts are summarized, including (1) the synthesis of small-pore Fe/zeolites; (2) nature of the SCR active Fe species in these catalysts as determined by experimental and theoretical approaches, including Fe species transformation during hydrothermal aging; (3) SCR reactions and structure-function correlations; and (4) a few aspects on industrial applications.
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25
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Understanding the high hydrothermal stability and NH3-SCR activity of the fast-synthesized ERI zeolite. J Catal 2020. [DOI: 10.1016/j.jcat.2020.08.033] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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26
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Advances in the Synthesis of Ferrierite Zeolite. Molecules 2020; 25:molecules25163722. [PMID: 32824105 PMCID: PMC7464850 DOI: 10.3390/molecules25163722] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 08/13/2020] [Accepted: 08/13/2020] [Indexed: 12/02/2022] Open
Abstract
As one of the most important porous materials, zeolites with intricate micropores have been widely employed as catalysts for decades due to their large pore volume, high surface area, and good thermal and hydrothermal stabilities. Among them, ferrierite (FER) zeolite with a two-dimensional micropore structure is an excellent heterogeneous catalyst for isomerization, carbonylation, cracking, and so on. In the past years, considering the important industrial application of FER zeolite, great efforts have been made to improve the synthesis of FER zeolite and thus decrease the synthesis cost and enhance catalytic performance. In this review, we briefly summarize the advances in the synthesis of FER zeolite including the development of synthesis routes, the use of organic templates, organotemplate-free synthesis, the strategies of morphology control, and the creation of intra-crystalline mesopores. Furthermore, the synthesis of hetero-atomic FER zeolites such as Fe-FER and Ti-FER has been discussed.
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27
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Li J, Li M, Song Q, Wang S, Cui X, Liu F, Liu X. Efficient recovery of Cu(II) by LTA-zeolites with hierarchical pores and their resource utilization in electrochemical denitrification: Environmentally friendly design and reutilization of waste in water. JOURNAL OF HAZARDOUS MATERIALS 2020; 394:122554. [PMID: 32240901 DOI: 10.1016/j.jhazmat.2020.122554] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 03/14/2020] [Accepted: 03/16/2020] [Indexed: 06/11/2023]
Abstract
Water pollution seriously endangers human health and the environment. Here we prepared and tested mesoporous LTA zeolites for the adsorption of Cu(II) from aqueous media and the captured copper was further used for electrochemical nitrate reduction. The prepared hierarchically porous LTA exhibited a high capacity (341.5 mg g-1) for Cu(II) adsorption, following the pseudo-second-order kinetic and Freundlich adsorption isotherm models well. The Cu-LTA sample was characterised by various analytical methods, and Cu(I) species were identified as the active sites for nitrate electrochemical reduction. Based on the spectral characterization and reducibility, strong metal-support interaction was found between copper and LTA, which is beneficial to the dispersion of active sites and their contacts with nitrates. In total, 10.1 g-N-NO3 g-1-Cu was reduced over the Cu-LTA-modified cathode in a three-electrode system with high N2 selectivity (92.1 %). Compared to purely microporous zeolites, mesoporous LTA has a higher capacity for Cu(II) removal and nitrate reduction. The mesoporous structure allows easy access to the inner active sites with low diffusion resistance. The low Tafel slope and high current density confirm the high activity of the mesoporous Cu-LTA, making it a promising and efficient material for the removal and reuse of heavy metal ions.
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Affiliation(s)
- Jiacheng Li
- Scholl of Environment, Tsinghua University, 30# Shuangqing Road, Hai Dian Distract, Beijing, 100086, China
| | - Miao Li
- Scholl of Environment, Tsinghua University, 30# Shuangqing Road, Hai Dian Distract, Beijing, 100086, China.
| | - Qinan Song
- Scholl of Environment, Tsinghua University, 30# Shuangqing Road, Hai Dian Distract, Beijing, 100086, China
| | - Sai Wang
- Scholl of Environment, Tsinghua University, 30# Shuangqing Road, Hai Dian Distract, Beijing, 100086, China
| | - Xiaofeng Cui
- Scholl of Environment, Tsinghua University, 30# Shuangqing Road, Hai Dian Distract, Beijing, 100086, China
| | - Fang Liu
- Scholl of Environment, Tsinghua University, 30# Shuangqing Road, Hai Dian Distract, Beijing, 100086, China
| | - Xiang Liu
- Scholl of Environment, Tsinghua University, 30# Shuangqing Road, Hai Dian Distract, Beijing, 100086, China
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28
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Preparation of Si-rich LTA zeolite membrane using organic template-free solution for methanol dehydration. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.116533] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Wang Y, Ji X, Meng H, Qu L, Wu X. Fabrication of high-silica Cu/ZSM-5 with confinement encapsulated Cu-based active species for NH3-SCR. CATAL COMMUN 2020. [DOI: 10.1016/j.catcom.2020.105969] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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30
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Wang Y, Nishitoba T, Wang Y, Meng X, Xiao FS, Zhang W, Marler B, Gies H, De Vos D, Kolb U, Feyen M, McGuire R, Parvulescu AN, Müller U, Yokoi T. Cu-Exchanged CHA-Type Zeolite from Organic Template-Free Synthesis: An Effective Catalyst for NH 3-SCR. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.9b06708] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yong Wang
- Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Toshiki Nishitoba
- Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Yunan Wang
- Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Xiangju Meng
- Department of Chemistry, Zhejiang University, Hangzhou 310028, China
| | - Feng-Shou Xiao
- Department of Chemistry, Zhejiang University, Hangzhou 310028, China
| | - Weiping Zhang
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Bernd Marler
- Institute of Geology, Mineralogy und Geophysics, Ruhr-University Bochum, Bochum 44780, Germany
| | - Hermann Gies
- Institute of Geology, Mineralogy und Geophysics, Ruhr-University Bochum, Bochum 44780, Germany
| | - Dirk De Vos
- Center for Surface Chemistry and Catalysis, K. U. Leuven, Leuven 3001, Belgium
| | - Ute Kolb
- Institute of Physical Chemistry, Johannes Gutenberg-University Mainz, Mainz 55128, Germany
| | - Mathias Feyen
- Process Research and Chemical Engineering, BASF SE, Ludwigshafen 67056, Germany
| | - Robert McGuire
- Process Research and Chemical Engineering, BASF SE, Ludwigshafen 67056, Germany
| | | | - Ulrich Müller
- Process Research and Chemical Engineering, BASF SE, Ludwigshafen 67056, Germany
| | - Toshiyuki Yokoi
- Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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Zhang J, Chu Y, Deng F, Feng Z, Meng X, Xiao FS. Evolution of D6R units in the interzeolite transformation from FAU, MFI or *BEA into AEI: transfer or reassembly? Inorg Chem Front 2020. [DOI: 10.1039/d0qi00359j] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The formation and evolution of building units for zeolites play an important role during crystallization.
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Affiliation(s)
- Juan Zhang
- Key Lab of Applied Chemistry of Zhejiang Province
- Department of Chemistry
- Zhejiang University
- Hangzhou
- China
| | - Yueying Chu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics
- Key Laboratory of Magnetic Resonance in Biological System
- National Center for Magnetic Resonance in Wuhan
- Wuhan Institute of Physics and Mathematics
- Chinese Academy of Sciences
| | - Feng Deng
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics
- Key Laboratory of Magnetic Resonance in Biological System
- National Center for Magnetic Resonance in Wuhan
- Wuhan Institute of Physics and Mathematics
- Chinese Academy of Sciences
| | - Zhaochi Feng
- State Key Laboratory of Catalysis
- Dalian Institute of Chemical Physics
- Chinese Academy of Sciences
- Dalian
- China
| | - Xiangju Meng
- Key Lab of Applied Chemistry of Zhejiang Province
- Department of Chemistry
- Zhejiang University
- Hangzhou
- China
| | - Feng-Shou Xiao
- Key Lab of Applied Chemistry of Zhejiang Province
- Department of Chemistry
- Zhejiang University
- Hangzhou
- China
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32
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Ohata Y, Nishitoba T, Yokoi T, Moteki T, Ogura M. Effect of Zeolite Topology on Cu Active Site Formation for NO Direct Decomposition. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2019. [DOI: 10.1246/bcsj.20190216] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yusuke Ohata
- Institute of Industrial Science, The University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Toshiki Nishitoba
- Chemical Resources Laboratory, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
| | - Toshiyuki Yokoi
- Chemical Resources Laboratory, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
- PRESTO, JST, Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
| | - Takahiko Moteki
- Institute of Industrial Science, The University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8505, Japan
- Unit of Elements Strategy Initiative for Catalysts & Batteries, Kyoto University, Katsura, Nishikyo, Kyoto 615-8510, Japan
| | - Masaru Ogura
- Institute of Industrial Science, The University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8505, Japan
- Unit of Elements Strategy Initiative for Catalysts & Batteries, Kyoto University, Katsura, Nishikyo, Kyoto 615-8510, Japan
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Di Iorio JR, Hoffman AJ, Nimlos CT, Nystrom S, Hibbitts D, Gounder R. Mechanistic origins of the high-pressure inhibition of methanol dehydration rates in small-pore acidic zeolites. J Catal 2019. [DOI: 10.1016/j.jcat.2019.10.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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34
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Cui Y, Wang Y, Mei D, Walter ED, Washton NM, Holladay JD, Wang Y, Szanyi J, Peden CH, Gao F. Revisiting effects of alkali metal and alkaline earth co-cation additives to Cu/SSZ-13 selective catalytic reduction catalysts. J Catal 2019. [DOI: 10.1016/j.jcat.2019.08.028] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Han L, Cai S, Gao M, Hasegawa JY, Wang P, Zhang J, Shi L, Zhang D. Selective Catalytic Reduction of NOx with NH3 by Using Novel Catalysts: State of the Art and Future Prospects. Chem Rev 2019; 119:10916-10976. [DOI: 10.1021/acs.chemrev.9b00202] [Citation(s) in RCA: 568] [Impact Index Per Article: 113.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Lupeng Han
- Department of Chemistry, College of Sciences, State Key Laboratory of Advanced Special Steel, Research Center of Nano Science and Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
| | - Sixiang Cai
- Department of Chemistry, College of Sciences, State Key Laboratory of Advanced Special Steel, Research Center of Nano Science and Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
- School of Materials Science and Engineering, Hainan University, Haikou 570228, Hainan, China
| | - Min Gao
- Institute for Catalysis, Hokkaido University, Sapporo 001-0021, Japan
| | - Jun-ya Hasegawa
- Institute for Catalysis, Hokkaido University, Sapporo 001-0021, Japan
| | - Penglu Wang
- Department of Chemistry, College of Sciences, State Key Laboratory of Advanced Special Steel, Research Center of Nano Science and Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
| | - Jianping Zhang
- Department of Chemistry, College of Sciences, State Key Laboratory of Advanced Special Steel, Research Center of Nano Science and Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
| | - Liyi Shi
- Department of Chemistry, College of Sciences, State Key Laboratory of Advanced Special Steel, Research Center of Nano Science and Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
| | - Dengsong Zhang
- Department of Chemistry, College of Sciences, State Key Laboratory of Advanced Special Steel, Research Center of Nano Science and Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
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Shin J, Jo D, Hong SB. Rediscovery of the Importance of Inorganic Synthesis Parameters in the Search for New Zeolites. Acc Chem Res 2019; 52:1419-1427. [PMID: 31013053 DOI: 10.1021/acs.accounts.9b00073] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Zeolites and related crystalline microporous materials with cavities and channels of molecular dimensions are of major importance for applications ranging from ion-exchange to adsorption and to catalysis. Because their unique shape-selective properties are closely related to the size, shape, and dimensionality of the intracrystalline channels and cavities, much interest has been devoted to the discovery of novel zeolitic materials over the last several decades. As a result, a dramatic expansion in the structural domain of crystalline microporous materials, as well as in their compositional range, has been achieved. This is largely due to the development of innovative synthetic strategies, for example, organic structure-directing agent (OSDA) design, introduction of heteroatoms like Ge in OSDA-mediated zeolite synthesis, topotactic transformation of two-dimensional layered zeolite precursors, assembly-disassembly-organization-reassembly method, etc. However, although many of these methodologies are quite successful in finding unprecedented zeolite structures, the resulting materials tend to be (hydro)thermally unstable and are often commercially impractical from a manufacturing perspective because of the high cost of the OSDA and/or heteroatom employed. Therefore, we focused on inorganic synthesis parameters as the key phase selectivity factor that has received relatively little attention in the search for new industrially relevant zeolites. This Account describes our recent efforts to find previously undiscovered aluminosilicate zeolites by boosting the roles of inorganic structure-directing agents (ISDAs) in the presence of OSDAs. They include the multiple inorganic cation and excess fluoride approaches, which aim to promote a synergistic cooperation between ISDAs and/or OSDAs and thus to hold a rational design concept, although the latter is not friendly to the practical zeolite manufacturing process due to the toxicity of fluoride. Using these two approaches, we were able to synthesize not only the second generation (PST-29) and four higher generations (PST-20 (RHO-G5), PST-25 (RHO-G6), PST-26 (RHO-G7), and PST-28 (RHO-G8)) of the RHO family of embedded isoreticular zeolites but also three other novel zeolite structures (EU-12, PST-21, and PST-22). We also explored the synthesis of a number of heteroatom-containing aluminophosphate (AlPO4) molecular sieves with different framework structures and unusually high framework charge density through the cooperative structure direction of alkali metal and small OSDA cations or under wholly inorganic conditions. Although we need to clarify the nature and extent of interactions between the inorganic cations and framework components in synthesis mixtures, we believe that our synthetic concepts, shedding new light on the importance of inorganic synthesis parameters, will open a door for achieving many other novel zeolite structures and compositions.
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Affiliation(s)
- Jiho Shin
- Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH, Pohang 37673, Korea
| | - Donghui Jo
- Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH, Pohang 37673, Korea
| | - Suk Bong Hong
- Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH, Pohang 37673, Korea
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Chen HY, Kollar M, Wei Z, Gao F, Wang Y, Szanyi J, Peden CH. Formation of NO+ and its possible roles during the selective catalytic reduction of NOx with NH3 on Cu-CHA catalysts. Catal Today 2019. [DOI: 10.1016/j.cattod.2017.12.022] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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39
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Zhang L, Wu Q, Meng X, Müller U, Feyen M, Dai D, Maurer S, McGuire R, Moini A, Parvulescu AN, Zhang W, Shi C, Yokoi T, Pan X, Bao X, Gies H, Marler B, De Vos DE, Kolb U, Xiao FS. Recent advances in the preparation of zeolites for the selective catalytic reduction of NOx in diesel engines. REACT CHEM ENG 2019. [DOI: 10.1039/c8re00214b] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Metal-exchanged zeolites with small pore sizes have attracted much attention in recent years due to their application in the selective catalytic reduction (SCR) of NOx in diesel engines.
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40
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Ryu T, Kang Y, Nam IS, Hong SB. Iron-exchanged high-silica LTA zeolites as hydrothermally stable NH3-SCR catalysts. REACT CHEM ENG 2019. [DOI: 10.1039/c9re00007k] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Iron-exchanged high-silica LTA zeolites exhibit high activity for selective catalytic reduction of NOx by NH3, even after hydrothermal aging at 900 °C.
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Affiliation(s)
- Taekyung Ryu
- Center for Ordered Nanoporous Materials Synthesis
- Division of Environmental Science and Engineering
- POSTECH
- Pohang 37673
- Korea
| | - Yonjoo Kang
- Center for Ordered Nanoporous Materials Synthesis
- Division of Environmental Science and Engineering
- POSTECH
- Pohang 37673
- Korea
| | - In-Sik Nam
- Center for Ordered Nanoporous Materials Synthesis
- Division of Environmental Science and Engineering
- POSTECH
- Pohang 37673
- Korea
| | - Suk Bong Hong
- Center for Ordered Nanoporous Materials Synthesis
- Division of Environmental Science and Engineering
- POSTECH
- Pohang 37673
- Korea
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41
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Shan Y, Shi X, Du J, Yu Y, He H. Cu-exchanged RTH-type zeolites for NH3-selective catalytic reduction of NOx: Cu distribution and hydrothermal stability. Catal Sci Technol 2019. [DOI: 10.1039/c8cy01933a] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The Cu-exchanged RTH-type zeolites (Cu-RTH) were applied in ammonia-selective catalytic reduction (NH3-SCR) of NOx.
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Affiliation(s)
- Yulong Shan
- State Key Joint Laboratory of Environment Simulation and Pollution Control
- Research Center for Eco-Environmental Sciences
- Chinese Academy of Sciences
- Beijing
- China
| | - Xiaoyan Shi
- State Key Joint Laboratory of Environment Simulation and Pollution Control
- Research Center for Eco-Environmental Sciences
- Chinese Academy of Sciences
- Beijing
- China
| | - Jinpeng Du
- State Key Joint Laboratory of Environment Simulation and Pollution Control
- Research Center for Eco-Environmental Sciences
- Chinese Academy of Sciences
- Beijing
- China
| | - Yunbo Yu
- State Key Joint Laboratory of Environment Simulation and Pollution Control
- Research Center for Eco-Environmental Sciences
- Chinese Academy of Sciences
- Beijing
- China
| | - Hong He
- State Key Joint Laboratory of Environment Simulation and Pollution Control
- Research Center for Eco-Environmental Sciences
- Chinese Academy of Sciences
- Beijing
- China
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42
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Ke Q, Sun T, Cheng H, Wei X, Guo Y, Zhao S, Zeng S, Wang S. Accelerated Construction of High-Silica RHO and CHA Zeolites via Interzeolite Transformation and Their NH3–SCR Performances after Copper Exchange. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b03907] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Quanli Ke
- Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Tianjun Sun
- Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
| | - Hao Cheng
- Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
| | - Xiaoli Wei
- Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Ya Guo
- Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Shengsheng Zhao
- Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
| | - Shu Zeng
- Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Shudong Wang
- Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
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Usui T, Liu Z, Ibe S, Zhu J, Anand C, Igarashi H, Onaya N, Sasaki Y, Shiramata Y, Kusamoto T, Wakihara T. Improve the Hydrothermal Stability of Cu-SSZ-13 Zeolite Catalyst by Loading a Small Amount of Ce. ACS Catal 2018. [DOI: 10.1021/acscatal.8b01949] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Toyohiro Usui
- IBIDEN Co. Ltd, 1-1, Kitagata, Ibigawa-cho, Ibi-gun, Gifu Pref. 501-0695, Japan
| | - Zhendong Liu
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Sayoko Ibe
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Jie Zhu
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Chokkalingam Anand
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Hirokazu Igarashi
- IBIDEN Co. Ltd, 1-1, Kitagata, Ibigawa-cho, Ibi-gun, Gifu Pref. 501-0695, Japan
| | - Naoki Onaya
- IBIDEN Co. Ltd, 1-1, Kitagata, Ibigawa-cho, Ibi-gun, Gifu Pref. 501-0695, Japan
| | - Yukichi Sasaki
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456-8587, Japan
| | - Yuji Shiramata
- Application Laboratory, Rigaku Corporation, 3-9-12, Matsubara-cho, Akishima-shi, Tokyo 196-8666, Japan
| | - Tetsuro Kusamoto
- Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Toru Wakihara
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Lee JH, Lee S, Hong SB. Nanocrystalline H-RTH Zeolite: An Efficient Catalyst for the Low-Temperature Dehydration of Ethanol to Ethene. CHEMSUSCHEM 2018; 11:2035-2039. [PMID: 29806732 DOI: 10.1002/cssc.201800864] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 05/14/2018] [Indexed: 06/08/2023]
Abstract
The low-temperature dehydration of bioethanol is an environmentally benign route to ethene production. Here we compare the catalytic properties of a series of cage-based small-pore zeolites with different framework structures, acid strengths, and/or crystallite sizes for ethanol dehydration at 200 °C under wet conditions (H2 O/EtOH=0.2). Among the zeolites studied here, nanocrystalline H-RTH was found to be considerably more effective than H-mordenite, the best catalyst for this reaction known to date, which can be rationalized by product shape selectivity. Whereas the acidity of this zeolite also plays a crucial role in selectively forming ethene, its nanocrystallinity is primarily responsible for the observed high catalyst durability.
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Affiliation(s)
- Jeong Hwan Lee
- Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Korea
| | - Sujin Lee
- Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Korea
| | - Suk Bong Hong
- Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Korea
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Abstract
In the past decade or so, small-pore zeolites have received greater attention than large- and medium-pore molecular sieves that have historically dominated the literature. This is primarily due to the commercialization of two major catalytic processes, NOx exhaust removal and methanol conversion to light olefins, that take advantage of the properties of these materials with smaller apertures. Small-pore zeolites possess pores that are constructed of eight tetrahedral atoms (Si4+ and Al3+), each time linked by a shared oxygen These eight-member ring pores (8MR) provide small molecules access to the intracrystalline void space, e.g., to NOx during car exhaust cleaning (NOx removal) or to methanol en route to its conversion into light olefins, while restricting larger molecule entrance and departure that is critical to overall catalyst performance. In total, there are forty-four structurally different small-pore zeolites. Forty-one of these zeolites can be synthesized, and the first synthetic zeolite (KFI, 1948) was in fact a small-pore material. Although the field of 8MR zeolite chemistry has expanded in many directions, the progress in synthesis is framework-specific, leaving insights and generalizations difficult to realize. This review first focuses on the relevant synthesis details of all 8MR zeolites and provides some generalized findings and related insights. Next, catalytic applications where 8MR zeolites either have been commercialized or have dominated investigations are presented, with the aim of providing structure-activity relationships. The review ends with a summary that discusses (i) both synthetic and catalytic progress, (ii) a list of opportunities in the 8MR zeolite field, and (iii) a brief future outlook.
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Affiliation(s)
- Michiel Dusselier
- Center for Surface Chemistry and Catalysis , KU Leuven , Celestijnenlaan 200F , 3001 Heverlee , Belgium
| | - Mark E Davis
- Chemical Engineering , California Institute of Technology , Mail Code 210-41, Pasadena , California 91125 , United States
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Abstract
Crystal engineering relies upon the ability to predictively control intermolecular interactions during the assembly of crystalline materials in a manner that leads to a desired (and predetermined) set of properties. Economics, scalability, and ease of design must be leveraged with techniques that manipulate the thermodynamics and kinetics of crystal nucleation and growth. It is often challenging to exact simultaneous control over multiple physicochemical properties, such as crystal size, habit, chirality, polymorph, and composition. Engineered materials often rely upon postsynthesis (top-down) processes to introduce properties that would otherwise be challenging to attain through direct (bottom-up) approaches. We discuss the application of crystal engineering to heterogeneous catalysts with a focus on four general themes: ( a) tailored nanocrystal size, ( b) controlled environments surrounding active sites, ( c) tuned morphology with well-defined facets, and ( d) hierarchical materials with disparate pore size and active site distributions. We focus on nonporous materials, including metals and metal oxides, and two classes of porous materials: zeolites and metal organic frameworks. We review novel synthesis methods involving synergistic experimental and computational design approaches, the challenges facing catalyst development, and opportunities for future advancement in crystal engineering.
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Affiliation(s)
- Jeffrey D Rimer
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, USA;
| | - Aseem Chawla
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, USA;
| | - Thuy T Le
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, USA;
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Bieseki L, Simancas R, Jordá JL, Bereciartua PJ, Cantín Á, Simancas J, Pergher SB, Valencia S, Rey F, Corma A. Synthesis and structure determination via ultra-fast electron diffraction of the new microporous zeolitic germanosilicate ITQ-62. Chem Commun (Camb) 2018; 54:2122-2125. [DOI: 10.1039/c7cc09240g] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A new multipore zeolite of 12–8 × 8 × 8 channel system, named ITQ-62, has been synthesized and its structure solved using electron diffraction tomography.
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Affiliation(s)
- Lindiane Bieseki
- Instituto de Tecnología Química (UPV-CSIC)
- Universitat Politècnica de València – Consejo Superior de Investigaciones Científicas
- 46022 Valencia
- Spain
- Universidade Federal do Rio Grande do Norte
| | - Raquel Simancas
- Instituto de Tecnología Química (UPV-CSIC)
- Universitat Politècnica de València – Consejo Superior de Investigaciones Científicas
- 46022 Valencia
- Spain
| | - Jose L. Jordá
- Instituto de Tecnología Química (UPV-CSIC)
- Universitat Politècnica de València – Consejo Superior de Investigaciones Científicas
- 46022 Valencia
- Spain
| | - Pablo J. Bereciartua
- Instituto de Tecnología Química (UPV-CSIC)
- Universitat Politècnica de València – Consejo Superior de Investigaciones Científicas
- 46022 Valencia
- Spain
| | - Ángel Cantín
- Instituto de Tecnología Química (UPV-CSIC)
- Universitat Politècnica de València – Consejo Superior de Investigaciones Científicas
- 46022 Valencia
- Spain
| | - Jorge Simancas
- Instituto de Tecnología Química (UPV-CSIC)
- Universitat Politècnica de València – Consejo Superior de Investigaciones Científicas
- 46022 Valencia
- Spain
| | | | - Susana Valencia
- Instituto de Tecnología Química (UPV-CSIC)
- Universitat Politècnica de València – Consejo Superior de Investigaciones Científicas
- 46022 Valencia
- Spain
| | - Fernando Rey
- Instituto de Tecnología Química (UPV-CSIC)
- Universitat Politècnica de València – Consejo Superior de Investigaciones Científicas
- 46022 Valencia
- Spain
| | - Avelino Corma
- Instituto de Tecnología Química (UPV-CSIC)
- Universitat Politècnica de València – Consejo Superior de Investigaciones Científicas
- 46022 Valencia
- Spain
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Greenaway AG, Lezcano-Gonzalez I, Agote-Aran M, Gibson EK, Odarchenko Y, Beale AM. Operando Spectroscopic Studies of Cu-SSZ-13 for NH 3-SCR deNOx Investigates the Role of NH 3 in Observed Cu(II) Reduction at High NO Conversions. Top Catal 2018; 61:175-182. [PMID: 30956504 PMCID: PMC6413821 DOI: 10.1007/s11244-018-0888-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The small pore zeolite chabazite (SSZ-13) in the copper exchanged form is a very efficient material for the selective catalytic reduction by ammonia (NH3) of nitrogen oxides (NOx) from the exhaust of lean burn engines, typically diesel powered vehicles. The full mechanism occurring during the NH3–SCR process is currently debated with outstanding questions including the nature and role of the catalytically active sites. Time-resolved operando spectroscopic techniques have been used to provide new level of insights in to the mechanism of NH3–SCR, to show that the origin of stable Cu(I) species under SCR conditions is potentially caused by an interaction between NH3 and the Cu cations located in eight ring sites of the bulk of the zeolite and is independent of the NH3–SCR of NOx occurring at Cu six ring sites within the zeolite.
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Affiliation(s)
- Alex G Greenaway
- 1Department of Chemistry, UCL, 20 Gordon Street, London, WC1H 0AJ UK.,2Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, Didcot, OX11 0FA UK
| | - Ines Lezcano-Gonzalez
- 1Department of Chemistry, UCL, 20 Gordon Street, London, WC1H 0AJ UK.,2Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, Didcot, OX11 0FA UK
| | - Miren Agote-Aran
- 1Department of Chemistry, UCL, 20 Gordon Street, London, WC1H 0AJ UK.,2Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, Didcot, OX11 0FA UK
| | - Emma K Gibson
- 1Department of Chemistry, UCL, 20 Gordon Street, London, WC1H 0AJ UK.,2Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, Didcot, OX11 0FA UK
| | - Yaroslav Odarchenko
- 1Department of Chemistry, UCL, 20 Gordon Street, London, WC1H 0AJ UK.,2Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, Didcot, OX11 0FA UK
| | - Andrew M Beale
- 1Department of Chemistry, UCL, 20 Gordon Street, London, WC1H 0AJ UK.,2Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, Didcot, OX11 0FA UK
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Wang X, Zhang K, Zhao W, Zhang Y, Lan Z, Zhang T, Xiao Y, Zhang Y, Chang H, Jiang L. Effect of Ceria Precursor on the Physicochemical and Catalytic Properties of Mn–W/CeO2 Nanocatalysts for NH3 SCR at Low Temperature. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b03466] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiuyun Wang
- National
Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, China
| | - Kai Zhang
- National
Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, China
| | - Weitao Zhao
- National
Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, China
| | - Yangyu Zhang
- National
Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, China
| | - Zhixin Lan
- National
Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, China
| | - Tianhua Zhang
- National
Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, China
| | - Yihong Xiao
- National
Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, China
| | - Yongfan Zhang
- National
Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, China
| | - Huazhen Chang
- School
of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
| | - Lilong Jiang
- National
Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, China
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50
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Burton A. Recent trends in the synthesis of high-silica zeolites. CATALYSIS REVIEWS-SCIENCE AND ENGINEERING 2017. [DOI: 10.1080/01614940.2017.1389112] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Allen Burton
- ExxonMobil Research and Engineering, Corporate Strategic Research, Active Materials Section, Annandale, NJ, USA
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