文献类型：期刊文献

英文题名：Effects of SiO2 Deposition on Surface Barriers and Catalytic Activity of Different Zeolites

作者：Liu, Junru[1];Hu, Shen[1];Chen, Jiaxuan[1];Meng, Jinlin[1];Ye, Guanghua[1];Zhou, Xinggui[1]

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

年份：2023

卷号：153

期号：2

起止页码：544

外文期刊名：CATALYSIS LETTERS

收录：;EI(收录号：20221611982338);WOS:【SCI-EXPANDED(收录号:WOS:000783029600001)】；

基金：This work was financially supported by the Shanghai Rising-Star Program (21QA1402000), the National Natural Science Foundation of China (22078090), the Natural Science Foundation of Shanghai (21ZR1418100), and the Open Project of State Key Laboratory of Chemical Engineering (SKL-ChE-21C02).

语种：英文

外文关键词：SiO2 deposition; Surface barriers; Zeolite; n-Pentane isomerization; Diffusion

摘要：External surface diffusion barriers can be as important as intracrystalline diffusion resistances in affecting zeolite catalysis. This work investigates how SiO2 deposition regulates surface barriers and affects catalytic activities for the zeolites with different pore sizes and dimensionalities (i.e., ZSM-22, ZSM-5, and Beta). n-Pentane isomerization is taken as the model reaction for catalytic tests. After SiO2 deposition, the apparent diffusivities for ZSM-22, ZSM-5, and Beta increase by 5-15%, 31-52%, and 34-37%. SiO2 deposition only modifies crystal surfaces as indicated by various structural characterizations, and thus these improvements in diffusion can be only attributed to the reduced surface barriers. Besides, the apparent catalytic activities for the catalysts using ZSM-22, ZSM-5, and Beta increase by 17-69%, 19-72%, and 3-60%, after SiO2 deposition. These results show that SiO2 deposition should be a universal method to reduce surface barriers on various zeolites and to improve zeolite catalysis for the reaction of n-pentane isomerization. [GRAPHICS] .