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Porous washcoat structure in CeO2 modified Cu-SSZ-13 monolith catalyst for NH3-SCR with improved catalytic performance |
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| Authors: | Wuyuan Liu Zhaoying Wang Ming Sun Jiajian Gao Lifeng Wang Zihan Gao Yingying Xu Xiangyun Zhao Cheng Zhang Lin Yu |
| Affiliation: | 1. Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher Education Institutions, School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, People's Republic of China
Contribution: Data curation (lead), Formal analysis (lead), ?Investigation (lead), Methodology (lead), Writing - review & editing (lead);2. Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher Education Institutions, School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, People's Republic of China Contribution: ?Investigation (supporting), Methodology (supporting), Resources (supporting);3. Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher Education Institutions, School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, People's Republic of China Contribution: Formal analysis (supporting), ?Investigation (supporting), Methodology (supporting), Writing - review & editing (supporting);4. Institute of Sustainability for Chemicals, Energy and Environment, A*STAR, Jurong Island, Singapore Contribution: Formal analysis (equal), Methodology (equal), Writing - review & editing (equal);5. Huizhou Ruihe Environmental Technology Ltd., Huizhou, China Contribution: Formal analysis (supporting), Methodology (supporting), Resources (supporting);6. Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher Education Institutions, School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, People's Republic of China Contribution: Formal analysis (supporting), ?Investigation (supporting), Resources (supporting);7. Shenzhen Candor Technology Ltd., Shenzhen, China Contribution: Data curation (supporting), Formal analysis (supporting), Methodology (supporting), Resources (supporting);8. North Rare Earth Huakai High-tech Hebei Co. Ltd, Hengshui, China Contribution: Formal analysis (supporting), Methodology (supporting), Resources (supporting);9. Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher Education Institutions, School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, People's Republic of China |
| Abstract: | A series of CeO2 modified Cu-SSZ-13 monolith catalysts were prepared by embedding CeO2 into the washcoat of Cu-SSZ-13 monolith catalyst through solvent combustion method. These CexCu-SSZ-13 catalysts were studied in the selective catalytic reduction (SCR) of NO with NH3, among which the Ce2Cu-SSZ-13 catalyst exhibited the best low-temperature activity, hydrothermal stability, and sulfur resistance. The physicochemical properties of the catalysts were characterized using multiple methods. Results showed that the acidity, redox capacity, and ammonia adsorption capacity significantly enhanced after CeO2 modification, thus leading to the high performance of Ce2Cu-SSZ-13 catalyst. Furthermore, the introduction of CeO2 induced the fast SCR reaction by promoting the oxidation of NO to NO2. Analog calculation suggested that the porous structure generated via solvent combustion in the washcoat effectively increased the diffusion rate of reaction. In situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFT) analysis showed that Brønsted acid sites were the main active center and the reaction followed Eley–Rideal mechanism. |
| Keywords: | low-temperature activity mass transport NH3-SCR solvent combustion method SSZ-13 zeolite |