Atomic layer deposition of silica to improve the high-temperature hydrothermal stability of Cu-SSZ-13 for NH3 SCR of NOx

Heyuan Tian; Yuan Ping; Yibo Zhang; Zeshu Zhang; Liwei Sun; Peng Liu; Junjiang Zhu; Xiangguang Yang

doi:10.1016/j.jhazmat.2021.126194

Atomic layer deposition of silica to improve the high-temperature hydrothermal stability of Cu-SSZ-13 for NH₃ SCR of NO_x

J Hazard Mater. 2021 Aug 15:416:126194. doi: 10.1016/j.jhazmat.2021.126194. Epub 2021 May 24.

Authors

Heyuan Tian¹, Yuan Ping², Yibo Zhang³, Zeshu Zhang¹, Liwei Sun⁴, Peng Liu¹, Junjiang Zhu⁵, Xiangguang Yang⁶

Affiliations

¹ 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.
² SPIC Yuanda Environmental Protection Catalyst Co., Ltd, Chongqing 401336, China.
³ 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. Electronic address: yibozhang@ciac.ac.cn.
⁴ 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.
⁵ School of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430200, Hubei, China. Electronic address: jjzhu@wtu.edu.cn.
⁶ 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. Electronic address: xgyang@ciac.ac.cn.

PMID: 34492958
DOI: 10.1016/j.jhazmat.2021.126194

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 NO_x 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.

Keywords: Atomic layer deposition; Chabazite zeolite catalyst; Cu-SSZ-13; Hydrothermal stability; Selective catalytic reduction.