1
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Ye H, Ren K, Wang P, Wang L. The investigation of the NH3-SCR performance of a copper-based AEI-CHA intergrown zeolite catalyst. Front Chem 2022; 10:1069824. [DOI: 10.3389/fchem.2022.1069824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Accepted: 11/07/2022] [Indexed: 12/05/2022] Open
Abstract
This work prepared an ISAPO-34/SAPO-18 intergrown zeolite using phosphate organoamine as the structure guiding agent. Physical-chemical characterizations by XRD, SEM, TG, and BET showed that the SAPO-34/SAPO-18 presents a cross-stacked cubic block-like microscopic morphology, with characteristic diffusive diffraction peaks at 2θ = 16–18° and 30–33° and a specific surface area of 557 m2 g−1. The series of copper-based catalysts prepared from SAPO-34/SAPO-18 showed a shift of the active temperature window to a lower temperature with increasing copper content. Moreover, the Brønsted acid site decreased significantly due to copper ion exchange and zeolite structure framework damage. Among them, the 1.2 wt% sample showed the widest active temperature window, with a T90 range of 175–435°C. After low-temperature hydrothermal aging treatment, the zeolite structure was eroded and the catalyst activity deteriorated significantly.
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2
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Yousefzadeh H, Bozbag SE, Sushkevich V, van Bokhoven JA, Erkey C. Stepwise conversion of methane to methanol over Cu-mordenite prepared by supercritical and aqueous ion exchange routes and quantification of active Cu species by H2-TPR. CATAL COMMUN 2022. [DOI: 10.1016/j.catcom.2022.106574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
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3
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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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4
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Zhang W, Shen M, Wang J, Li X, Wang J, Shen G, Wang C. Unraveling the nature of cerium on stabilizing Cu/SAPO-34 NH3-SCR catalysts under hydrothermal aging at low temperatures. J RARE EARTH 2022. [DOI: 10.1016/j.jre.2022.07.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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5
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Recent progress in the selective catalytic reduction of NO with NH3 on Cu-SAPO-34 catalysts. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2021.112111] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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6
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Zhang S, Meng Y, Pang L, Ding Q, Chen Z, Guo Y, Cai W, Li T. Understanding the direct relationship between various structure-directing agents and low-temperature hydrothermal durability over Cu-SAPO-34 during the NH3-SCR reaction. Catal Sci Technol 2022. [DOI: 10.1039/d1cy02046c] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydrolysis of Si–O(H)–Al bonds and the loss of active Cu(OH)+ species jointly contribute towards the deactivation of Cu-SAPO-34 under a moist environment at low temperature (<100 °C).
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Affiliation(s)
- Shoute Zhang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Ying Meng
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Lei Pang
- DongFeng Trucks R&D Center, Zhushanhu Road No. 653, Wuhan 430056, P. R. China
| | - Qianzhao Ding
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Zhen Chen
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Yanbing Guo
- Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan, 430079, PR China
| | - Weiquan Cai
- School of Chemistry and Chemical Engineering, Guangzhou Higher Education Mega Center, Guangzhou University, 230 Wai Huan Xi Road, Guangzhou, 510006, China
| | - Tao Li
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
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7
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Jiang H, Guan B, Peng X, Wei Y, Liu Z, Wu X, Chen T, Lin H, Huang Z. Hydrothermal tolerance towards different temperature conditions over two typical Cu/CHA catalysts. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111846] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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8
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Wang Q, Shen M, Wang J, Wang C, Wang J. Nature of cerium on improving low-temperature hydrothermal stability of SAPO-34. J RARE EARTH 2021. [DOI: 10.1016/j.jre.2020.06.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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9
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Lin Q, Liu S, Xu S, Xu S, Pei M, Yao P, Xu H, Dan Y, Chen Y. Comprehensive effect of tuning Cu/SAPO-34 crystals using PEG on the enhanced hydrothermal stability for NH 3-SCR. Catal Sci Technol 2021. [DOI: 10.1039/d1cy01194d] [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
PEG fabricates advantageous hierarchical zeolite crystals, enhancing the high-temperature and low-temperature hydrothermal stability of Cu/SAPO-34.
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Affiliation(s)
- Qingjin Lin
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu 610064, China
| | - Shuang Liu
- Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610064, China
| | - Shuhao Xu
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China
| | - Shi Xu
- Weichai Power Co., Ltd, Weifang 261061, Shangdong, China
| | - Mingming Pei
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China
| | - Pan Yao
- Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610064, China
| | - Haidi Xu
- Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610064, China
- Center of Engineering of Vehicular Exhaust Gases Abatement, Chengdu 610064, Sichuan, China
- Center of Engineering of Environmental Catalytic Material, Chengdu 610064, Sichuan, China
| | - Yi Dan
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu 610064, China
| | - Yaoqiang Chen
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China
- Center of Engineering of Vehicular Exhaust Gases Abatement, Chengdu 610064, Sichuan, China
- Center of Engineering of Environmental Catalytic Material, Chengdu 610064, Sichuan, China
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10
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Remarkable self-degradation of Cu/SAPO-34 selective catalytic reduction catalysts during storage at ambient conditions. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.01.034] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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11
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Lin Q, Lin C, Liu J, Liu S, Xu H, Chen Y, Dan Y. Optimization of Hybrid Crystal with SAPO-5/34 on Hydrothermal Stability for deNOx Reaction by NH3. Chem Res Chin Univ 2020. [DOI: 10.1007/s40242-020-0117-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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12
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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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13
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Cao Y, Fan D, Zhu D, Sun L, Cao L, Tian P, Liu Z. The effect of Si environments on NH3 selective catalytic reduction performance and moisture stability of Cu-SAPO-34 catalysts. J Catal 2020. [DOI: 10.1016/j.jcat.2020.09.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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14
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Chen J, Peng G, Liang T, Zhang W, Zheng W, Zhao H, Guo L, Wu X. Catalytic Performances of Cu/MCM-22 Zeolites with Different Cu Loadings in NH 3-SCR. NANOMATERIALS 2020; 10:nano10112170. [PMID: 33143192 PMCID: PMC7694057 DOI: 10.3390/nano10112170] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 10/24/2020] [Accepted: 10/27/2020] [Indexed: 11/16/2022]
Abstract
The NH3-SCR activities and hydrothermal stabilities of five xCu/MCM-22 zeolites with different Cu loadings (x = 2–10 wt%) prepared by incipient wetness impregnation method were systematically investigated. The physicochemical properties of xCu/MCM-22 zeolites were analyzed by XRD, nitrogen physisorption, ICP-AES, SEM, NH3-TPD, UV-vis, H2-TPR and XPS experiments. The Cu species existing in xCu/MCM-22 are mainly isolated Cu2+, CuOx and unreducible copper species. The concentrations of both isolated Cu2+ and CuOx species in xCu/MCM-22 increase with Cu contents, but the increment of CuOx species is more distinct, especially in high Cu loadings (>4 wt%). NH3-SCR experimental results demonstrated that the activity of xCu/MCM-22 is sensitive to Cu content at low Cu loadings (≤4 wt%). When the Cu loading exceeds 4 wt%, the NH3-SCR activity of xCu/MCM-22 is irrelevant to Cu content due to the severe pore blockage effects caused by aggregated CuOx species. Among the five xCu/MCM-22 zeolites, 4Cu/MCM-22 with moderate Cu content has the best NH3-SCR performance, which displays higher than 80% NOx conversions in a wide temperature window (160–430 °C). Furthermore, the hydrothermal aging experiments (xCu/MCM-22 was treated at 750 °C for 10 h under 10% water vapor atmosphere) illustrated that all the xCu/MCM-22 zeolites exhibit high hydrothermal stability in NH3-SCR reactions.
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Affiliation(s)
- Jialing Chen
- Key Laboratory of Hubei Province for Coal Conversion and New Carbon Materials, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China; (G.P.); (W.Z.); (W.Z.); (H.Z.)
- Correspondence: (J.C.); (L.G.); (X.W.)
| | - Gang Peng
- Key Laboratory of Hubei Province for Coal Conversion and New Carbon Materials, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China; (G.P.); (W.Z.); (W.Z.); (H.Z.)
| | - Tingyu Liang
- Key Laboratory for Green Chemical Process of Ministry of Education, and Hubei Key Laboratory of Novel Reactor & Green Chemical Technology, School of Chemical Engineering & Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China;
| | - Wenbo Zhang
- Key Laboratory of Hubei Province for Coal Conversion and New Carbon Materials, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China; (G.P.); (W.Z.); (W.Z.); (H.Z.)
| | - Wei Zheng
- Key Laboratory of Hubei Province for Coal Conversion and New Carbon Materials, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China; (G.P.); (W.Z.); (W.Z.); (H.Z.)
| | - Haoran Zhao
- Key Laboratory of Hubei Province for Coal Conversion and New Carbon Materials, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China; (G.P.); (W.Z.); (W.Z.); (H.Z.)
| | - Li Guo
- Key Laboratory of Hubei Province for Coal Conversion and New Carbon Materials, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China; (G.P.); (W.Z.); (W.Z.); (H.Z.)
- Correspondence: (J.C.); (L.G.); (X.W.)
| | - Xiaoqin Wu
- Key Laboratory of Hubei Province for Coal Conversion and New Carbon Materials, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China; (G.P.); (W.Z.); (W.Z.); (H.Z.)
- Correspondence: (J.C.); (L.G.); (X.W.)
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15
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Yan N, Ma C, Cao Y, Liu X, Cao L, Guo P, Tian P, Liu Z. Rational Design of a Novel Catalyst Cu-SAPO-42 for NH 3 -SCR Reaction. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2000902. [PMID: 32686318 DOI: 10.1002/smll.202000902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 06/07/2020] [Indexed: 06/11/2023]
Abstract
Cu-exchanged LTA-type aluminosilicate catalyst has been considered as an efficient catalyst for the selective catalytic reduction of NOx with ammonia (NH3 -SCR). However, expensive organic structure-directing agents (OSDAs) and the corrosive fluoride medium are inevitably used to synthesize LTA-type molecular sieve (high-silica LTA-type aluminosilicate and its analogue LTA-type silicoaluminophosphate SAPO-42). Herein, a series of cheap and commercialized OSDAs, which are successfully applied for the targeted synthesis of SAPO-42 in the fluoride-free system, are identified by a novel RSS (refine, summarize, and search) approach. Furthermore, Cu-SAPO-42 catalysts are utilized for NH3 -SCR. Among these catalysts, Cu-SAPO-42 prepared with 2-(butylamino)ethanol (BAEA) as OSDA demonstrates the excellent activity even after hydrothermal aging at 800 °C for 16 h, which shows much better hydrothermal stability than the commercialized Cu-SAPO-34 catalyst with comparable Si and Cu contents. Electron paramagnetic resonance (EPR) spectroscopy and Rietveld refinement are performed to identify the locations of active Cu2+ ions. It turns out that the active Cu2+ ions are distributed near the center of single 6-rings of the lta cage.
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Affiliation(s)
- Nana Yan
- National Engineering Laboratory for Methanol to Olefins, 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
| | - Chao Ma
- National Engineering Laboratory for Methanol to Olefins, 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
- Zhang Dayu School of Chemistry, Dalian University of Technology, Dalian, 116024, P.R. China
| | - Yi Cao
- National Engineering Laboratory for Methanol to Olefins, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P.R. China
- School of Material Science and Chemical Engineering, Ningbo University, Ningbo, 315211, P.R. China
| | - Xiaona Liu
- National Engineering Laboratory for Methanol to Olefins, 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
| | - Lei Cao
- National Engineering Laboratory for Methanol to Olefins, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P.R. China
| | - Peng Guo
- National Engineering Laboratory for Methanol to Olefins, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P.R. China
| | - Peng Tian
- National Engineering Laboratory for Methanol to Olefins, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P.R. China
| | - Zhongmin Liu
- National Engineering Laboratory for Methanol to Olefins, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P.R. China
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16
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Pétaud G, Gaillard F, Tayakout M, Gil S, Giroir‐Fendler A. Spotlight on Large Surface Copper Cluster Role of Cu‐SAPO‐34 Catalyst in Standard NH
3
‐SCR Performances. ChemCatChem 2020. [DOI: 10.1002/cctc.201902036] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Guillaume Pétaud
- Université de Lyon, Université Claude Bernard Lyon 1 IRCELYON, CNRS, UMR 5256 2 avenue Albert Einstein Villeurbanne F-69622 France
| | - François Gaillard
- Université de Lyon, Université Claude Bernard Lyon 1 IRCELYON, CNRS, UMR 5256 2 avenue Albert Einstein Villeurbanne F-69622 France
| | - Melaz Tayakout
- Université de Lyon, Université Claude Bernard Lyon 1 LAGEPP, CNRS, UMR 5007 43 Bd du 11 Novembre 1918 Villeurbanne F-69622 France
| | - Sonia Gil
- Université de Lyon, Université Claude Bernard Lyon 1 IRCELYON, CNRS, UMR 5256 2 avenue Albert Einstein Villeurbanne F-69622 France
| | - Anne Giroir‐Fendler
- Université de Lyon, Université Claude Bernard Lyon 1 IRCELYON, CNRS, UMR 5256 2 avenue Albert Einstein Villeurbanne F-69622 France
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17
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Comparing the Nature of Active Sites in Cu-loaded SAPO-34 and SSZ-13 for the Direct Conversion of Methane to Methanol. Catalysts 2020. [DOI: 10.3390/catal10020191] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
On our route towards a more sustainable future, the use of stranded and underutilized natural gas to produce chemicals would be a great aid in mitigating climate change, due to the reduced CO2 emissions in comparison to using petroleum. In this study, we investigate the performance of Cu-exchanged SSZ-13 and SAPO-34 microporous materials in the stepwise, direct conversion of methane to methanol. With the use of X-ray absorption spectroscopy, infrared (in combination with CO adsorption) and Raman spectroscopy, we compared the structure–activity relationships for the two materials. We found that SSZ-13 performed significantly better than SAPO-34 at the standard conditions. From CH4-TPR, it is evident that SAPO-34 requires a higher temperature for CH4 oxidation, and by changing the CH4 loading temperature from 200 to 300 °C, the yield (μmol/g) of SAPO-34 was increased tenfold. As observed from spectroscopy, both three- and four-fold coordinated Cu-species were formed after O2-activation; among them, the active species for methane activation. The Cu speciation in SAPO-34 is distinct from that in SSZ-13. These deviations can be attributed to several factors, including the different framework polarities, and the amount and distribution of ion exchange sites.
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18
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Woo J, Bernin D, Ahari H, Shost M, Zammit M, Olsson L. Regeneration of water-deactivated Cu/SAPO-34(MO) with acids. Catal Sci Technol 2020. [DOI: 10.1039/c9cy02031d] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Deactivation and acid regeneration of Cu/SAPO-34 used for NH3 SCR.
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Affiliation(s)
- Jungwon Woo
- Chemical Engineering
- Competence Centre for Catalysis
- Chalmers University of Technology
- 412 96 Gothenburg
- Sweden
| | - Diana Bernin
- Chemical Engineering
- Competence Centre for Catalysis
- Chalmers University of Technology
- 412 96 Gothenburg
- Sweden
| | | | | | | | - Louise Olsson
- Chemical Engineering
- Competence Centre for Catalysis
- Chalmers University of Technology
- 412 96 Gothenburg
- Sweden
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19
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Woo J, Bernin D, Ahari H, Shost M, Zammit M, Olsson L. Regeneration of Cu/SAPO-34(MO) with H 2O only: too good to be true? Catal Sci Technol 2020. [DOI: 10.1039/c9cy01981b] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Illustration of the proposed mechanism for deactivation and regeneration of Cu/SAPO-34(MO) with H2O.
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Affiliation(s)
- Jungwon Woo
- Chemical Engineering, Competence Centre for Catalysis
- Chalmers University of Technology
- 412 96 Gothenburg
- Sweden
| | - Diana Bernin
- Chemical Engineering, Competence Centre for Catalysis
- Chalmers University of Technology
- 412 96 Gothenburg
- Sweden
| | | | | | | | - Louise Olsson
- Chemical Engineering, Competence Centre for Catalysis
- Chalmers University of Technology
- 412 96 Gothenburg
- Sweden
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20
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A Critical Review of Recent Progress and Perspective in Practical Denitration Application. Catalysts 2019. [DOI: 10.3390/catal9090771] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Nitrogen oxides (NOx) represent one of the main sources of haze and pollution of the atmosphere as well as the causes of photochemical smog and acid rain. Furthermore, it poses a serious threat to human health. With the increasing emission of NOx, it is urgent to control NOx. According to the different mechanisms of NOx removal methods, this paper elaborated on the adsorption method represented by activated carbon adsorption, analyzed the oxidation method represented by Fenton oxidation, discussed the reduction method represented by selective catalytic reduction, and summarized the plasma method represented by plasma-modified catalyst to remove NOx. At the same time, the current research status and existing problems of different NOx removal technologies were revealed and the future development prospects were forecasted.
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21
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Unraveling the mysterious failure of Cu/SAPO-34 selective catalytic reduction catalysts. Nat Commun 2019; 10:1137. [PMID: 30850592 PMCID: PMC6408507 DOI: 10.1038/s41467-019-09021-3] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Accepted: 01/29/2019] [Indexed: 11/08/2022] Open
Abstract
Commercial Cu/SAPO-34 selective catalytic reduction (SCR) catalysts have experienced unexpected and quite perplexing failure. Understanding the causes at an atomic level is vital for the synthesis of more robust Cu/SAPO-34 catalysts. Here we show, via application of model catalysts with homogeneously dispersed isolated Cu ions, that Cu transformations resulting from low-temperature hydrothermal aging and ambient temperature storage can be semi-quantitatively probed with 2-dimensional pulsed electron paramagnetic resonance. Coupled with kinetics, additional material characterizations and DFT simulations, we propose the following catalyst deactivation steps: (1) detachment of Cu(II) ions from cationic positions in the form of Cu(OH)2; (2) irreversible hydrolysis of the SAPO-34 framework forming terminal Al species; and (3) interaction between Cu(OH)2 and terminal Al species forming SCR inactive, Cu-aluminate like species. Especially significant is that these reactions are greatly facilitated by condensed water molecules under wet ambient conditions, causing low temperature failure of the commercial Cu/SAPO-34 catalysts. Understanding the failure of commercial Cu/SAPO-34 selective catalytic reduction (SCR) catalysts at an atomic level is vital for the synthesis of more robust catalysts. Here the authors unravel the mysterious failure of Cu/SAPO-34 SCR catalysts via application of model catalysts and 2-dimensional pulsed electron paramagnetic resonance
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Woo J, Bernin D, Ahari H, Shost M, Zammit M, Olsson L. Understanding the mechanism of low temperature deactivation of Cu/SAPO-34 exposed to various amounts of water vapor in the NH3-SCR reaction. Catal Sci Technol 2019. [DOI: 10.1039/c9cy00240e] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Water-exposure at 70 °C deteriorates Cu/SAPO-34, the extent of which depends on water exposure time, reaction temperature, and choice of SDAs.
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Affiliation(s)
- Jungwon Woo
- Chemical Engineering
- Competence Centre for Catalysis
- Chalmers University of Technology
- 412 96 Gothenburg
- Sweden
| | - Diana Bernin
- Chemical Engineering
- Competence Centre for Catalysis
- Chalmers University of Technology
- 412 96 Gothenburg
- Sweden
| | - Homayoun Ahari
- Fiat Chrysler Automobile US (FCA USA LLC)
- Auburn Hills
- USA
| | - Mark Shost
- Fiat Chrysler Automobile US (FCA USA LLC)
- Auburn Hills
- USA
| | - Michael Zammit
- Fiat Chrysler Automobile US (FCA USA LLC)
- Auburn Hills
- USA
| | - Louise Olsson
- Chemical Engineering
- Competence Centre for Catalysis
- Chalmers University of Technology
- 412 96 Gothenburg
- Sweden
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Pétaud G, Gil S, Fendler AG. Cu SAPO 34 One Pot Hydrothermal Preparation Method for Particular Copper Configuration. Top Catal 2018. [DOI: 10.1007/s11244-018-1107-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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