文献类型：期刊文献

英文题名：Synthesis of Al-incorporated sulfated zirconia with improved and stabilized surface sulfur species for removal of trace olefins from aromatics

作者：Wang, Sitan[1];Yin, Tao[1];Meng, Xuan[1];Liu, Naiwang[1];Shi, Li[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2022

卷号：12

期号：1

起止页码：212

外文期刊名：CATALYSIS SCIENCE & TECHNOLOGY

收录：;EI(收录号：20220311463962);WOS:【SCI-EXPANDED(收录号:WOS:000720771900001)】；

基金：We gratefully acknowledge financial support from the National Natural Science Foundation of China (No. 21808054).

语种：英文

外文关键词：Aluminum compounds - Aromatization - Catalyst activity - Chemical reactors - Precipitation (chemical) - Reusability - Sulfur - Zirconia

摘要：Al-Incorporated sulfated zirconia with improved and stabilized surface sulfur species was synthesized via the co-precipitation method and used as an effective catalyst to remove trace olefins from aromatics in a fixed-bed reactor. The textural and chemical properties of various catalysts were characterized by XRD, Al-27 MAS NMR, N-2 adsorption, EA, XPS, H-2-TPR, FT-IR, and pyridine-infrared (IR) spectroscopy techniques to elucidate the Al promoting effect on acid centres and catalytic performance. The results demonstrated that incorporating Al into zirconia could effectively stabilize the tetragonal zirconia with small grain size and improve surface sulfur species, thereby balancing the distribution of Bronsted and Lewis acid sites. Consequently, sulfated zirconia incorporating Al at the level of Al/Zr < 7.5 mol% exhibited more outstanding catalytic activity and stability under a long reaction time compared with conventional sulfated zirconia. Notably, superior reusability with a negligible drop in olefins conversion over five reaction cycles was obtained in the presence of the Al-2.50-SZ. The alkylation reaction process of olefins with aromatics was further investigated by the GC-MS technique when Al-x-SZ was used as the catalyst.