文献类型：期刊文献

英文题名：Revealing the mechanisms of NH3 adsorption and reactions in catalytic NOx reduction over Cux/CHA zeolites by in situ DRIFTS spectroscopy

作者：Shen, Yali[1];Wang, Zhiqiang[2,3];Ge, Shasha[1];Wang, Li[1];Zhan, Wangcheng[1];Dai, Qiguang[1];Guo, Yanglong[1];Guo, Yun[1];Wang, Aiyong[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Res Inst Ind Catalysis, State Key Lab Green Chem Engn & Ind Catalysis, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Ctr Computat Chem, Sch Chem & Mol Engn, State Key Lab Green Chem Engn & Ind Catalysis, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Res Inst Ind Catalysis, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2024

卷号：353

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY

收录：;EI(收录号：20241715955502);WOS:【SCI-EXPANDED(收录号:WOS:001370753600001)】；

基金：This work was supported by the National Key Research and Development Program of China (2023YFA1508500), the National Natural Science Foundation of China (22106101, U21A20326), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：NH3-SCR; Cu-SSZ-13; NH3 solvation; Intra-zeolite oxolation

摘要：Adsorption and activation of NH3 on Cu-SSZ-13 were essential for NOx removal, however, their important role at the molecular level remains unclear. In this work, the Al-rich Cu/SSZ-13 (Cu-x/CHA) catalysts were synthesized by the incipient-wetness impregnation method, and the NH3-SCR performance was investigated. It is found that high Cu content promoted the formation of Z-[Cu(OH)](+) and CuOx particles, enhanced the adsorption capacity of NOx, and increased the intra-zeolite oxolation process in the Cu-x/CHA catalysts. In situ DRIFTS results showed that the Z-[Cu(OH)(NH3)(x)]+(x<3) exhibited analogous properties to B-NH4+, but it would convert to Z-[Cu(OH) (NH3)(3)](+) with increasing NH3 adsorption time and exhibit L-NH3 properties. Those findings could provide a new insight into understanding the adsorption and activation of NH3 in low-temperature reactions, as well as new ideas for improving NOx conversion during cold start.