文献类型：期刊文献

英文题名：Enhanced low-temperature performance of Al-rich Cu-SSZ-13 by Ce modification upon hydrothermal aging for NH3-SCR

作者：Shen, Yali[1];Li, Tiantian[1];Yang, Jing[1];Wang, Aiyong[1];Wang, Li[1];Zhan, Wangcheng[1];Guo, Yanglong[1];Guo, Yun[1]

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

年份：2023

卷号：473

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20233314532794);WOS:【SCI-EXPANDED(收录号:WOS:001087435200001)】；

基金：The authors from East China University of Science and Technology acknowledge support from the National Key Research and Development Program of China (2022YFB3504200), the National Natural Science Foundation of China (U21A20326, 22106101), 111 Project (B08021), and the fund of the National Engineering Laboratory for Mobile Source Emission Control Technology (NELMS2020A05), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：NH3-SCR; Cu-SSZ-13; Ce modification; Hydrothermal aging

摘要：3wt.% Cu/SSZ-13 (Cu3/Z) and Ce modified 3wt.% Cu/SSZ-13 (Ce-Cu3/Z) catalysts were prepared and then hydrothermally aged. The Ce-modified Ce-Cu3/Z catalyst revealed excellent NH3-SCR activity and hydrothermal stability. Combined with a series of characterizations, it was proved that the introduction of Ce could inhibit the dealumination, and prevent the aggregation of Cu ions to form CuOx and CuAl2O4 species upon hydrothermal aging, thus improving the hydrothermal stability of Ce-Cu3/Z. In addition, Ce could interact with Cu species to enhance the reducibility of catalyst, and the interaction between Ce and Cu species was strengthened after hydrothermal aging. Also, the presence of Ce species could enhance the NH3 and NOx adsorption capacity of the catalyst, resulting in higher NH3-SCR activity of Ce-Cu3/Z after hydrothermaly aged at 700 degrees C. In situ DRIFTS results showed that the NH3-SCR reaction followed both E-R and L-H mechanisms on the Cu3/Z-700 and Ce-Cu3/ Z-700 catalysts at 150 degrees C. Ce doping could promote the formation of L-NH3 (NH3 species coordinated to Lewis acid sites) and nitrate species on the Ce-Cu3/Z-700 catalyst, as well as the involvement of L-NH3 in the reaction, which play a crucial role as the main active intermediates at low temperature.