文献类型：期刊文献

英文题名：Application of Ce modified zeolite to improve the performance of cresol isomerization

作者：Dong, Zhuoyi[1];Wang, Sitan[1];Fei, Kai[1];Shi, Li[1];Meng, Xuan[1];Liu, Naiwang[1]

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

年份：2024

卷号：683

外文期刊名：APPLIED CATALYSIS A-GENERAL

收录：;EI(收录号：20242516271418);WOS:【SCI-EXPANDED(收录号:WOS:001259020100001)】；

语种：英文

外文关键词：Beta zeolite; Cresol; Disproportionation; Isomerisation

摘要：This study clarifies the mechanism behind the isomerization of cresol, focusing on a shaped cerium -modified Beta zeolite. The catalysts were characterized using a series of characterization techniques, including XRD, Py-IR, XPS, and TGA. The results emphasize the pivotal role of cerium, particularly at a 5 % modification concentration, in improving catalyst acidity. The mechanism of isomerization is revealed through kinetic calculation of reversible monomolecular systems, emphasizing the significance of acid sites. TGA analysis of catalyst deactivation reveals distinctive carbon deposition patterns, with the cerium -modified zeolite displaying enhanced resistance to pore blockage through Type II carbon deposition. XPS analysis post -deactivation indicates an increased proportion of Ce 3+ , suggesting elevated oxygen vacancies and unsaturated chemical bonds, influencing the catalytic activity negatively. In summary, an appropriate cerium modification, especially at the 5 % concentration, strikes a balance between enhanced acidity and resistance to carbon deposition, providing valuable insights for tailoring zeolite catalysts in cresol isomerization.