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Tian H, Ping Y, Zhang Y, Zhang Z, Sun L, Liu P, Zhu J, Yang X. Atomic layer deposition of silica to improve the high-temperature hydrothermal stability of Cu-SSZ-13 for NH 3 SCR of NO x. JOURNAL OF HAZARDOUS MATERIALS 2021; 416:126194. [PMID: 34492958 DOI: 10.1016/j.jhazmat.2021.126194] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 05/18/2021] [Accepted: 05/20/2021] [Indexed: 06/13/2023]
Abstract
The improvement of stability is a crucial and challenging issue for industrial catalyst, which affects not only the service time but also the cost of catalyst. This is especially prominent for that applied in harsh environment atmospheres, such as the exhaust of diesel vehicles. Herein, we reported a new strategy to improve the high-temperature hydrothermal stability of Cu-SSZ-13, which is a promising catalyst for the treatment of exhaust emitted from diesel vehicles through the NH3-SCR NOx route. Different from that reported in literature, we managed to improve the high-temperature hydrothermal stability of Cu-SSZ-13 by coating the surface with a nanolayer of stable SiO2 material using the atomic layer deposition (ALD) method. The coating of SiO2 layers effectively suppressed the leaching of alumina from the SSZ-13 molecular sieve even after the hydrothermal aging at 800 °C for 16 h with 12.5% water in air. Meanwhile, the ultra-thin SiO2 nanolayer does not block the pores of zeolites and affect the catalytic activity of Cu-SSZ-13 contribute to the superiority of the ALD technology.
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Affiliation(s)
- Heyuan Tian
- State Key Laboratory of Rare Earth Resource Utilization, Jilin Province Key Laboratory of Green Chemistry and Process, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China; University of Science and Technology of China, Hefei 230026, Anhui, China
| | - Yuan Ping
- SPIC Yuanda Environmental Protection Catalyst Co., Ltd, Chongqing 401336, China
| | - Yibo Zhang
- State Key Laboratory of Rare Earth Resource Utilization, Jilin Province Key Laboratory of Green Chemistry and Process, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China; Ganjiang Innovation Academy, Chinese Academy of Sciences, Jiangxi 341000, China.
| | - Zeshu Zhang
- State Key Laboratory of Rare Earth Resource Utilization, Jilin Province Key Laboratory of Green Chemistry and Process, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China; University of Science and Technology of China, Hefei 230026, Anhui, China
| | - Liwei Sun
- State Key Laboratory of Rare Earth Resource Utilization, Jilin Province Key Laboratory of Green Chemistry and Process, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China
| | - Peng Liu
- State Key Laboratory of Rare Earth Resource Utilization, Jilin Province Key Laboratory of Green Chemistry and Process, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China; University of Science and Technology of China, Hefei 230026, Anhui, China
| | - Junjiang Zhu
- School of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430200, Hubei, China.
| | - Xiangguang Yang
- State Key Laboratory of Rare Earth Resource Utilization, Jilin Province Key Laboratory of Green Chemistry and Process, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China; University of Science and Technology of China, Hefei 230026, Anhui, China; Ganjiang Innovation Academy, Chinese Academy of Sciences, Jiangxi 341000, China.
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Recent Understanding of Low-Temperature Copper Dynamics in Cu-Chabazite NH3-SCR Catalysts. Catalysts 2021. [DOI: 10.3390/catal11010052] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Dynamic motion of NH3-solvated Cu sites in Cu-chabazite (Cu-CHA) zeolites, which are the most promising and state-of-the-art catalysts for ammonia-assisted selective reduction of NOx (NH3-SCR) in the aftertreatment of diesel exhausts, represents a unique phenomenon linking heterogeneous and homogeneous catalysis. This review first summarizes recent advances in the theoretical understanding of such low-temperature Cu dynamics. Specifically, evidence of both intra-cage and inter-cage Cu motions, given by ab initio molecular dynamics (AIMD) or metadynamics simulations, will be highlighted. Then, we will show how, among others, synchrotron-based X-ray spectroscopy, vibrational and optical spectroscopy (diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) and diffuse reflection ultraviolet-visible spectroscopy (DRUVS)), electron paramagnetic spectroscopy (EPR), and impedance spectroscopy (IS) can be combined and complement each other to follow the evolution of coordinative environment and the local structure of Cu centers during low-temperature NH3-SCR reactions. Furthermore, the essential role of Cu dynamics in the tuning of low-temperature Cu redox, in the preparation of highly dispersed Cu-CHA catalysts by solid-state ion exchange method, and in the direct monitoring of NH3 storage and conversion will be presented. Based on the achieved mechanistic insights, we will discuss briefly the new perspectives in manipulating Cu dynamics to improve low-temperature NH3-SCR efficiency as well as in the understanding of other important reactions, such as selective methane-to-methanol oxidation and ethene dimerization, catalyzed by metal ion-exchanged zeolites.
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Wang P, Li Z, Wang X, Tong Y, Yuan F, Zhu Y. One‐pot synthesis of Cu/SAPO‐34 with hierarchical pore using cupric citrate as a copper source for excellent NH
3
‐SCR of NO performance. ChemCatChem 2020. [DOI: 10.1002/cctc.202000818] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Peiqiang Wang
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education School of Chemistry and Materials Heilongjiang University Harbin 150080 P. R. China
| | - Zhibin Li
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education School of Chemistry and Materials Heilongjiang University Harbin 150080 P. R. China
| | - Xiaotong Wang
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education School of Chemistry and Materials Heilongjiang University Harbin 150080 P. R. China
| | - Yongming Tong
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education School of Chemistry and Materials Heilongjiang University Harbin 150080 P. R. China
| | - Fulong Yuan
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education School of Chemistry and Materials Heilongjiang University Harbin 150080 P. R. China
| | - Yujun Zhu
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education School of Chemistry and Materials Heilongjiang University Harbin 150080 P. R. China
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Wang Y, Ji X, Meng H, Qu L, Wu X. Fabrication of high-silica Cu/ZSM-5 with confinement encapsulated Cu-based active species for NH3-SCR. CATAL COMMUN 2020. [DOI: 10.1016/j.catcom.2020.105969] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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