文献类型：期刊文献

英文题名：Reducing External Surface Diffusion Barriers by Chemical Vapor Deposition for Improved Zeolite Catalysis

作者：Hu, Shen[1];Liu, Junru[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：2022

卷号：61

期号：17

起止页码：5747

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20221712036889);WOS:【SCI-EXPANDED(收录号:WOS:000798993000006)】；

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

语种：英文

外文关键词：Zeolites - Deposition rates - Paraffins - Catalysis - Chemical vapor deposition - Catalyst activity - Silicon

摘要：External surface diffusion barriers have proven to bevery important in affecting zeolite catalysis, and surfacemodification to regulate surface barriers becomes an effectiveway to improve zeolite catalysts. This work probes how chemicalvapor deposition (CVD) of SiO2affects surface barriers and zeolitecatalysis, withn-pentane isomerization catalyzed by beta zeolite asthe model reaction. During the deposition, TEOS molecules reactwith SiOH groups on zeolite external surface, and SiO2phase isformed on the surface in calcination. The deposition temperatureof 373 K is preferable, as it balances the loss of acid sites and thedeposition rate. Surface barriers are reduced after the CVD ofSiO2, and an optimal SiO2loading should exist as too much SiO2can significantly narrow and block surface pores. The SiO2deposited Pt/beta catalyst can be up to 132% higher inn-pentane conversion than its parent counterpart. In terms of the apparentcatalytic activity, an optimal SiO2loading should exist to balance the loss of acid sites and the reduction of surface barriers. This workfinds CVD can effectively reduce surface barriers on beta zeolite and subsequently improve its apparent catalytic activity