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Yuan EH, Han R, Deng JY, Zhou W, Zhou A. Acceleration of Zeolite Crystallization: Current Status, Mechanisms, and Perspectives. ACS APPLIED MATERIALS & INTERFACES 2024; 16:29521-29546. [PMID: 38830265 DOI: 10.1021/acsami.4c01774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2024]
Abstract
Zeolites are important classes of crystalline materials and possess well-defined channels and cages with molecular dimensions. They have been extensively employed as heterogeneous catalysts and gas adsorbents due to their relatively large specific surface areas, high pore volumes, compositional flexibility, definite acidity, and hydrothermal stability. The zeolite synthesis normally undergoes high-temperature hydrothermal treatments with a relatively long crystallization time, which exhibits low synthesis efficiency and high energy consumption. Various strategies, e.g., modulation of the synthesis gel compositions, employment of special silica/aluminum sources, addition of seeds, fluoride, hydroxyl (·OH) free radical initiators, and organic additives, regulation of the crystallization conditions, development of new approaches, etc., have been developed to overcome these obstacles. And, these achievements make prominent contributions to the topic of acceleration of the zeolite crystallization and promote the fundamental understanding of the zeolite formation mechanism. However, there is a lack of the comprehensive summary and analysis on them. Herein, we provide an overview of the recent achievements, highlight the significant progress in the past decades on the developments of novel and remarkable strategies to accelerate the crystallization of zeolites, and basically divide them into three main types, i.e., chemical methods, physical methods, and the derived new approaches. The principles/acceleration mechanisms, effectiveness, versatility, and degree of reality for the corresponding approaches are thoroughly discussed and summarized. Finally, the rational design of the prospective strategies for the fast synthesis of zeolites is commented on and envisioned. The information gathered here is expected to provide solid guidance for developing a more effective route to improve the zeolite crystallization and obtain the functional zeolite-based materials with more shortened durations and lowered cost and further promote their applications.
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Affiliation(s)
- En-Hui Yuan
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
| | - Rui Han
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
| | - Jun-Yu Deng
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
| | - Wenwu Zhou
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
| | - Anning Zhou
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
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Zhang L, Shan Y, Yan Z, Liu Z, Yu Y, He H. Efficient Pt/KFI zeolite catalysts for the selective catalytic reduction of NO x by hydrogen. J Environ Sci (China) 2024; 138:102-111. [PMID: 38135379 DOI: 10.1016/j.jes.2023.03.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Revised: 03/02/2023] [Accepted: 03/02/2023] [Indexed: 12/24/2023]
Abstract
Aiming at purification of NOx from hydrogen internal combustion engines (HICEs), the hydrogen selective catalytic reduction (H2-SCR) reaction was investigated over a series of Pt/KFI zeolite catalysts. H2 can readily reduce NOx to N2 and N2O while O2 inhibited the deNOx efficiency by consuming the reductant H2. The Pt/KFI zeolite catalysts with Pt loading below 0.1 wt.% are optimized H2-SCR catalysts due to its suitable operation temperature window since high Pt loading favors the H2-O2 reaction which lead to the insufficient of reactants. Compared to metal Pt0 species, Ptδ+ species showed lower activation energy of H2-SCR reaction and thought to be as reasonable active sites. Further, Eley-Rideal (E-R) reaction mechanism was proposed as evidenced by the reaction orders in kinetic studies. Last, the optimized reactor was designed with hybrid Pt/KFI catalysts with various Pt loading which achieve a high NOx conversion in a wide temperature range.
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Affiliation(s)
- Ligang Zhang
- School of Rare Earths, University of Science and Technology of China, Hefei 230026, China; Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, 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.
| | - Zidi Yan
- Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, China
| | - 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
| | - Yunbo Yu
- School of Rare Earths, University of Science and Technology of China, Hefei 230026, China; Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Hong He
- School of Rare Earths, University of Science and Technology of China, Hefei 230026, China; Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
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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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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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Guan B, Zhou J, Liu Z, Wu X, Wei Y, Guo J, Jiang H, Lin H, Huang Z. Degenerating effect of transformation and loss of active sites on NH3-SCR activity during the hydrothermal aging process for Cu-SSZ-13 molecular sieve catalyst. Chem Eng Sci 2023. [DOI: 10.1016/j.ces.2023.118487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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7
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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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Lozinska MM, Bruce EL, Mattock J, Chitac RG, Cox PA, Turrina A, Wright PA. Understanding the Anion-Templated, OSDA-Free, Interzeolite Conversion Synthesis of High Silica Zeolite ZK-5. Chemistry 2022; 28:e202201689. [PMID: 35821198 DOI: 10.1002/chem.202201689] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Indexed: 01/07/2023]
Abstract
High silica zeolite ZK-5 (framework Si/Al=4.8) has been prepared by interzeolite conversion from ultrastable zeolite Y via a co-templating route using alkali metal cations and nitrate anions but without organic structure directing agents. The mechanism, which involves zeolite framework - alkali metal cation - nitrate anion ordering, has been established by a combination of chemical and thermal analyses, Raman spectroscopy, computational modelling, and X-ray powder diffraction. Ammonium exchange gives ZK-5 with occluded ammonium nitrate and subsequent heating gives microporous zeolite ZK-5.
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Affiliation(s)
- Magdalena M Lozinska
- EaStCHEM School of Chemistry, University of St Andrews, Purdie Building, North Haugh, St Andrews, KY16 9ST, UK
| | - Elliott L Bruce
- EaStCHEM School of Chemistry, University of St Andrews, Purdie Building, North Haugh, St Andrews, KY16 9ST, UK
| | - James Mattock
- School of Pharmacy and Biomedical Sciences, University of Portsmouth, Portsmouth, PO1 2DT, UK
| | - Ruxandra G Chitac
- EaStCHEM School of Chemistry, University of St Andrews, Purdie Building, North Haugh, St Andrews, KY16 9ST, UK
| | - Paul A Cox
- School of Pharmacy and Biomedical Sciences, University of Portsmouth, Portsmouth, PO1 2DT, UK
| | - Alessandro Turrina
- Johnson Matthey Technology Centre, Chilton P.O. Box 1, Belasis Avenue, Billingham, TS23 1LB, UK
| | - Paul A Wright
- EaStCHEM School of Chemistry, University of St Andrews, Purdie Building, North Haugh, St Andrews, KY16 9ST, UK
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Abstract
Zeolites with ordered microporous systems, distinct framework topologies, good spatial nanoconfinement effects, and superior (hydro)thermal stability are an ideal scaffold for planting diverse active metal species, including single sites, clusters, and nanoparticles in the framework and framework-associated sites and extra-framework positions, thus affording the metal-in-zeolite catalysts outstanding activity, unique shape selectivity, and enhanced stability and recyclability in the processes of Brønsted acid-, Lewis acid-, and extra-framework metal-catalyzed reactions. Especially, thanks to the advances in zeolite synthesis and characterization techniques in recent years, zeolite-confined extra-framework metal catalysts (denoted as metal@zeolite composites) have experienced rapid development in heterogeneous catalysis, owing to the combination of the merits of both active metal sites and zeolite intrinsic properties. In this review, we will present the recent developments of synthesis strategies for incorporating and tailoring of active metal sites in zeolites and advanced characterization techniques for identification of the location, distribution, and coordination environment of metal species in zeolites. Furthermore, the catalytic applications of metal-in-zeolite catalysts are demonstrated, with an emphasis on the metal@zeolite composites in hydrogenation, dehydrogenation, and oxidation reactions. Finally, we point out the current challenges and future perspectives on precise synthesis, atomic level identification, and practical application of the metal-in-zeolite catalyst system.
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Affiliation(s)
- Qiang Zhang
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China.,International Center of Future Science, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China
| | - Shiqin Gao
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China.,International Center of Future Science, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China
| | - Jihong Yu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China.,International Center of Future Science, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China
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10
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Comparison of Industrial and Lab-Scale Ion Exchange for the DeNOx-SCR Performance of Cu Chabazites: A Case Study. Catalysts 2022. [DOI: 10.3390/catal12080880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The efficiency and robustness of selective catalytic reduction (SCR) by NH3 catalysts for exhaust gas purification, especially of heavy-duty diesel engines, will continue to play a major role, despite the increasing electrification of powertrains. With that in mind, the effect of the synthesis scale on commercially available Cu-exchanged chabazite catalysts for SCR was investigated through physicochemical characterizations and catalytic tests. During hydrothermal aging, both industrial and lab-scale prepared catalysts underwent structural dealumination of the zeolite framework and redistribution of the Al sites. Although both catalysts demonstrated similar NO conversion activity under SCR conditions, the lab-scale catalyst showed higher selectivity and lower activity in NH3 oxidation. Variations in N2O formation and NH3 oxidation rate were found to correlate with the formation of different copper species, and the compositions become less controllable in industrial-scale process. This case study focused on routes of ion exchange, and the results provide new insights into catalytic performance of the industrially-produced zeolites.
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11
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Structural analysis of Cu/Zeolite with controlled Si/Al ratio and the resulting thermal stability. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.08.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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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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Wu R, Han J, Wang Y, Chen M, Tian P, Zhou X, Xu J, Zhang JN, Yan W. Exclusive SAPO-seeded synthesis of ZK-5 zeolite for selective synthesis of methylamines. Inorg Chem Front 2022. [DOI: 10.1039/d2qi01544g] [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
ZK-5 zeolite with superior selectivity for monomethylamine (MMA) plus dimethylamine (DMA) is fast synthesized using the exclusive silicoaluminophosphate SAPO-34 seed and K+ and Na+ cations.
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Affiliation(s)
- Rui Wu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
| | - Jinfeng Han
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
| | - Yunzheng Wang
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
| | - Mengyang Chen
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
| | - Peng Tian
- National Engineering Laboratory for Methanol to Olefins, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Xue Zhou
- National Centre for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Jun Xu
- National Centre for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Jia-Nan Zhang
- College of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Wenfu Yan
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
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14
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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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15
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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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16
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Raman G. Study of the Relationship between Synthesis Descriptors and the Type of Zeolite Phase Formed in ZSM‐43 Synthesis by Using Machine Learning. ChemistrySelect 2021. [DOI: 10.1002/slct.202102890] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ganesan Raman
- Reliance Research & Development Center Reliance Corporate Park, Reliance Industries Limited Thane-Belapur Road, Ghansoli Navi Mumbai India 400701
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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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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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19
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Song I, Lee H, Jeon SW, Ibrahim IAM, Kim J, Byun Y, Koh DJ, Han JW, Kim DH. Simple physical mixing of zeolite prevents sulfur deactivation of vanadia catalysts for NO x removal. Nat Commun 2021; 12:901. [PMID: 33568656 PMCID: PMC7876025 DOI: 10.1038/s41467-021-21228-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 01/15/2021] [Indexed: 12/21/2022] Open
Abstract
NOx abatement has been an indispensable part of environmental catalysis for decades. Selective catalytic reduction with ammonia using V2O5/TiO2 is an important technology for removing NOx emitted from industrial facilities. However, it has been a huge challenge for the catalyst to operate at low temperatures, because ammonium bisulfate (ABS) forms and causes deactivation by blocking the pores of the catalyst. Here, we report that physically mixed H-Y zeolite effectively protects vanadium active sites by trapping ABS in micropores. The mixed catalysts operate stably at a low temperature of 220 °C, which is below the dew point of ABS. The sulfur resistance of this system is fully maintained during repeated aging/regeneration cycles because the trapped ABS easily decomposes at 350 °C. Further investigations reveal that the pore structure and the amount of framework Al determined the trapping ability of various zeolites.
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Affiliation(s)
- Inhak Song
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, Republic of Korea
| | - Hwangho Lee
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, Republic of Korea
| | - Se Won Jeon
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, Republic of Korea
| | - Ismail A M Ibrahim
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, Republic of Korea
- Department of Chemistry, Faculty of Science, Helwan University, Ain-Helwan, Cairo, Egypt
| | - Joonwoo Kim
- Research Institute of Industrial Science and Technology (RIST), Gwangyang-si, Jeollanam-do, Republic of Korea
| | - Youngchul Byun
- Research Institute of Industrial Science and Technology (RIST), Gwangyang-si, Jeollanam-do, Republic of Korea
| | - Dong Jun Koh
- Research Institute of Industrial Science and Technology (RIST), Gwangyang-si, Jeollanam-do, Republic of Korea
| | - Jeong Woo Han
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, Republic of Korea
| | - Do Heui Kim
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, Republic of Korea.
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20
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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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21
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Abstract
The effect of Mn impregnation on the NH3-SCR (selective catalytic reduction of NOx by NH3) activity of in situ synthesized Cu-SSZ-13 was investigated in this work. It was found that Mn addition could efficiently improve the low-temperature activity of Cu-SSZ-13. The optimal amount of Mn was 5 wt.%, and NOx conversion was improved by more than 20% over a temperature range of 120 °C to 150 °C. SEM (scanning electron microscopy), XRD (X-ray diffraction), N2 adsorption-desorption, H2-TPR (temperature programmed reduction of H2), NH3-TPD (temperature programmed desorption of NH3) and in situ DRIFTS (diffuse reflectance infrared Fourier transform spectroscopy) experiments were conducted to investigate the changes in the zeolite structure, active sites, acid sites and reaction mechanism. The impregnated MnOx species caused a decline in the crystallinity of Cu-SSZ-13 but markedly improved the redox ability. Nitrate and nitrite species were observed in the Mn-modified Cu-SSZ-13, and the formation of these species was thought to cause the observed increase in low-temperature NH3-SCR activity. The results show that the addition of Mn is a promising method for promoting the low-temperature catalytic activity of Cu-SSZ-13.
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22
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Zhang T, Chen Z, Walsh AG, Li Y, Zhang P. Single-Atom Catalysts Supported by Crystalline Porous Materials: Views from the Inside. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2002910. [PMID: 32656812 DOI: 10.1002/adma.202002910] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 05/24/2020] [Indexed: 06/11/2023]
Abstract
Single-atom catalysts (SACs) have recently emerged as an exciting system in heterogeneous catalysis showing outstanding performance in many catalytic reactions. Single-atom catalytic sites alone are not stable and thus require stabilization from substrates. Crystalline porous materials such as zeolites and metal-organic frameworks (MOFs) are excellent substrates for SACs, offering high stability with the potential to further enhance their performance due to synergistic effects. This review features recent work on the structure, electronic, and catalytic properties of zeolite and MOF-protected SACs, offering atomic-scale views from the "inside" thanks to the subatomic resolution of synchrotron X-ray absorption spectroscopy (XAS). The extended X-ray absorption fine structure and associated methods will be shown to be powerful tools in identifying the single-atom site and can provide details into the coordination environment and bonding disorder of SACs. The X-ray absorption near-edge structure will be demonstrated as a valuable method in probing the electronic properties of SACs by analyzing the white line intensity, absorption edge shift, and pre-/postedge features. Emphasis is also placed on in situ/operando XAS using state-of-the-art equipment, which can unveil the changes in structure and properties of SACs during the dynamic catalytic processes in a highly sensitive and time-resolved manner.
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Affiliation(s)
- Tianjun Zhang
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
| | - Ziyi Chen
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, B3H 4R2, Canada
| | - Andrew G Walsh
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, B3H 4R2, Canada
| | - Yi Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
- International Center of Future Science, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
| | - Peng Zhang
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, B3H 4R2, Canada
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23
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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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24
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Liu C, Bi Y, Han J, Guo M, Liu Q. A Perspective on the Relationship Between Microstructure and Performance of Cu-Based Zeolites for the Selective Catalytic Reduction of NOx. CATALYSIS SURVEYS FROM ASIA 2020. [DOI: 10.1007/s10563-020-09302-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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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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26
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Du J, Shi X, Shan Y, Xu G, Sun Y, Wang Y, Yu Y, Shan W, He H. Effects of SO2 on Cu-SSZ-39 catalyst for the selective catalytic reduction of NOx with NH3. Catal Sci Technol 2020. [DOI: 10.1039/c9cy02186h] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The impact of SO2 on Cu-SSZ-39 was firstly investigated, and sulfation mechanism at different temperature was proposed.
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Affiliation(s)
- 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
| | - 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
| | - 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
| | - Guangyan Xu
- State Key Joint Laboratory of Environment Simulation and Pollution Control
- Research Center for Eco-Environmental Sciences
- Chinese Academy of Sciences
- Beijing 100085
- China
| | - Yu Sun
- State Key Joint Laboratory of Environment Simulation and Pollution Control
- Research Center for Eco-Environmental Sciences
- Chinese Academy of Sciences
- Beijing 100085
- China
| | - Yingjie Wang
- 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
| | - Wenpo Shan
- 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
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27
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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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28
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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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Xu H, Zhang J, Wu Q, Chen W, Lei C, Zhu Q, Han S, Fei J, Zheng A, Zhu L, Meng X, Maurer S, Dai D, Parvulescu AN, Müller U, Xiao FS. Direct Synthesis of Aluminosilicate SSZ-39 Zeolite Using Colloidal Silica as a Starting Source. ACS APPLIED MATERIALS & INTERFACES 2019; 11:23112-23117. [PMID: 31252486 DOI: 10.1021/acsami.9b03048] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
For the first time, SSZ-39 zeolite has been directly prepared using conventional colloidal silica and sodium aluminate instead of using FAU zeolite as the raw material in the alkaline media. The adjustment of the Si/Al ratios in the starting materials to the suitable values is a key factor to prepare the aluminosilicate SSZ-39 zeolite. Various characterizations (for instance, X-ray diffraction, scanning electron microscopy, nitrogen sorption, solid 27Al NMR, and NH3-temperature-programmed desorption) display that the aluminosilicate SSZ-39 zeolite owns high crystallinity, uniform cuboid morphology, large surface area, four-coordinated aluminum species, and strong acidic sites. Inductively coupled plasma analysis shows that the SiO2/Al2O3 ratios of the SSZ-39 products are ranged from 12.8 to 16.8. Considering the special framework of the SSZ-39 zeolite, the yield of this synthesis is not higher than 21.3%. Moreover, the catalytic performance of Cu-SSZ-39 catalyst synthesized from this route is excellent in the selective catalytic reduction of NO x with NH3 (NH3-SCR).
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Affiliation(s)
- Hao Xu
- Key Laboratory of Applied Chemistry of Zhejiang Province , Zhejiang University , Hangzhou 310028 , China
| | - Juan Zhang
- Key Laboratory of Applied Chemistry of Zhejiang Province , Zhejiang University , Hangzhou 310028 , China
| | - Qinming Wu
- Key Laboratory of Applied Chemistry of Zhejiang Province , Zhejiang University , Hangzhou 310028 , China
| | - Wei Chen
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic Resonance , Wuhan Institute of Physics and Mathematics , Wuhan 430071 , China
| | - Chi Lei
- Key Laboratory of Applied Chemistry of Zhejiang Province , Zhejiang University , Hangzhou 310028 , China
| | - Qiuyan Zhu
- Key Laboratory of Applied Chemistry of Zhejiang Province , Zhejiang University , Hangzhou 310028 , China
| | - Shichao Han
- Key Laboratory of Applied Chemistry of Zhejiang Province , Zhejiang University , Hangzhou 310028 , China
| | - Jinhua Fei
- Key Laboratory of Applied Chemistry of Zhejiang Province , Zhejiang University , Hangzhou 310028 , China
| | - Anmin Zheng
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic Resonance , Wuhan Institute of Physics and Mathematics , Wuhan 430071 , China
| | - Longfeng Zhu
- College of Biological, Chemical Sciences and Engineering , Jiaxing University , Jiaxing 314001 , China
| | - Xiangju Meng
- Key Laboratory of Applied Chemistry of Zhejiang Province , Zhejiang University , Hangzhou 310028 , China
| | - Stefan Maurer
- BASF Catalysts (Shanghai) Co., Ltd. , 239 Luqiao Road , Jinqiao Export Process Zone Pudong New District, Shanghai 201206 , China
| | - Daniel Dai
- BASF Catalysts (Shanghai) Co., Ltd. , 239 Luqiao Road , Jinqiao Export Process Zone Pudong New District, Shanghai 201206 , China
| | | | - Ulrich Müller
- BASF SE, GCC/PZ , Carl-Bosch-Strasse 38 , Ludwigshafen 67056 , Germany
| | - Feng-Shou Xiao
- Key Laboratory of Applied Chemistry of Zhejiang Province , Zhejiang University , Hangzhou 310028 , China
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Xin Y, Zhang N, Wang X, Li Q, Ma X, Qi Y, Zheng L, Anderson JA, Zhang Z. Efficient synthesis of the Cu-SAPO-44 zeolite with excellent activity for selective catalytic reduction of NO by NH3. Catal Today 2019. [DOI: 10.1016/j.cattod.2018.08.018] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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31
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Seed-assisted, organic structure-directing agent-free synthesis of KFI-type zeolite with enhanced micropore volume and CO2 adsorption capacity. ADSORPTION 2019. [DOI: 10.1007/s10450-019-00113-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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32
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Kang JH, Alshafei FH, Zones SI, Davis ME. Cage-Defining Ring: A Molecular Sieve Structural Indicator for Light Olefin Product Distribution from the Methanol-to-Olefins Reaction. ACS Catal 2019. [DOI: 10.1021/acscatal.9b00746] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jong Hun Kang
- Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Faisal H. Alshafei
- Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Stacey I. Zones
- Chevron Energy Technology Co., 100 Chevron Way, Richmond, California 94802, United States
| | - Mark E. Davis
- Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
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33
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Li S, Li J, Dong M, Fan S, Zhao T, Wang J, Fan W. Strategies to control zeolite particle morphology. Chem Soc Rev 2019; 48:885-907. [DOI: 10.1039/c8cs00774h] [Citation(s) in RCA: 117] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Methods to synthesize zeolites with different crystal habits and assemble zeolite crystals into specific structures are reviewed for the rational design of zeolite particle morphologies.
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Affiliation(s)
- Shiying Li
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan
- P. R. China
| | - Junfen Li
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan
- P. R. China
| | - Mei Dong
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan
- P. R. China
| | - Subing Fan
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering
- College of Chemistry and Chemical Engineering
- Ningxia University
- Yinchuan City
- P. R. China
| | - Tiansheng Zhao
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering
- College of Chemistry and Chemical Engineering
- Ningxia University
- Yinchuan City
- P. R. China
| | - Jianguo Wang
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan
- P. R. China
| | - Weibin Fan
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan
- P. R. China
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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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Lin Q, Liu J, Liu S, Xu S, Lin C, Feng X, Wang Y, Xu H, Chen Y. Barium-promoted hydrothermal stability of monolithic Cu/BEA catalyst for NH 3-SCR. Dalton Trans 2018; 47:15038-15048. [PMID: 30303233 DOI: 10.1039/c8dt03156h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
As a promising candidate for NOx elimination from the emission of diesel engines, the enhancement effect of Ba on the hydrothermal stability of cordierite supported CuBa/BEA at 600 °C for 48 h was investigated by XRD, NH3-TPD, H2-TPR, XPS, EPR, TEM and in situ DRIFTS. Different properties and amounts of active species are significant factors contributing to the enhanced hydrothermal stability of CuBa/BEA-HT. CuBa/BEA-HT has more Cu2+/Cu+ redox-couples and stronger interactions than Cu/BEA-HT, indicating an excellent redox property of the active species in CuBa/BEA-HT. The better redox property of CuBa/BEA-HT produces more nitrates that easily participate in the NH3-SCR reaction, which enhances the low-temperature activity. Furthermore, as observed from EPR and H2-TPR, the appearance of more isolated Cu2+ species and fewer CuO species also contribute to the higher hydrothermal stability of CuBa/BEA-HT.
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Affiliation(s)
- Qingjin Lin
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, 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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Zhang K, Fernandez S, Ostraat ML. Understanding Commonalities and Interplay Between Organotemplate‐Free Zeolite Synthesis, Hierarchical Structure Creation, and Interzeolite Transformation. ChemCatChem 2018. [DOI: 10.1002/cctc.201800612] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ke Zhang
- Aramco Research Center - BostonAramco Services Company 400 Technology Square Cambridge MA 02139 United States
| | - Sergio Fernandez
- Aramco Research Center - BostonAramco Services Company 400 Technology Square Cambridge MA 02139 United States
| | - Michele L. Ostraat
- Aramco Research Center - BostonAramco Services Company 400 Technology Square Cambridge MA 02139 United States
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38
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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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