Selective mono-alkylbenzene disproportionation over silylated MFI zeolite

Chuang, Yao-Yuan; Ou, Mu Fang; Ho, Grace H.; Du, Kun-Jia; Liu, Shang-Bin; Tsai, Tseng-Chang

doi:10.1016/j.cattod.2020.08.020

Cited by 5 publications

(2 citation statements)

References 12 publications

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“…29,30 They also studied the effect of CVD of SiO 2 on alkylation and disproportionation of toluene catalyzed by ZSM-5 zeolite and observed a higher para-isomer selectivity in both reactions after the SiO 2 deposition. 31−33 Chuang et al 34 and Das et al 35 reported the similar observations in toluene disproportionation catalyzed by ZSM-5 zeolite. Besides, Roger et al 36 found that the separation selectivity of a p-xylene/o-xylene mixture became higher after CVD of SiO 2 on ZSM-5 zeolite.…”

Section: ■ Introductionmentioning

confidence: 72%

“…CVD of SiO 2 on zeolites can improve shape selectivity in separation and catalysis processes by narrowing pore-opening size and passivating external surface acid sites, which has been extensively reported in the literature. For example, Niwa and his co-workers deposited SiO 2 by using CVD on MFI and MOR zeolites and found the pore-opening size can be tuned by changing SiO 2 loading. , They also studied the effect of CVD of SiO 2 on alkylation and disproportionation of toluene catalyzed by ZSM-5 zeolite and observed a higher para-isomer selectivity in both reactions after the SiO 2 deposition. − Chuang et al and Das et al reported the similar observations in toluene disproportionation catalyzed by ZSM-5 zeolite. Besides, Röger et al found that the separation selectivity of a p -xylene/ o -xylene mixture became higher after CVD of SiO 2 on ZSM-5 zeolite.…”

Section: Introductionmentioning

confidence: 82%

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Reducing External Surface Diffusion Barriers by Chemical Vapor Deposition for Improved Zeolite Catalysis

Liu

Chen

et al. 2022

Ind. Eng. Chem. Res.

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External surface diffusion barriers have proven to be very important in affecting zeolite catalysis, and surface modification to regulate surface barriers becomes an effective way to improve zeolite catalysts. This work probes how chemical vapor deposition (CVD) of SiO2 affects surface barriers and zeolite catalysis, with n-pentane isomerization catalyzed by beta zeolite as the model reaction. During the deposition, TEOS molecules react with SiOH groups on zeolite external surface, and SiO2 phase is formed on the surface in calcination. The deposition temperature of 373 K is preferable, as it balances the loss of acid sites and the deposition rate. Surface barriers are reduced after the CVD of SiO2, and an optimal SiO2 loading should exist as too much SiO2 can significantly narrow and block surface pores. The SiO2 deposited Pt/beta catalyst can be up to 132% higher in n-pentane conversion than its parent counterpart. In terms of the apparent catalytic activity, an optimal SiO2 loading should exist to balance the loss of acid sites and the reduction of surface barriers. This work finds CVD can effectively reduce surface barriers on beta zeolite and subsequently improve its apparent catalytic activity.

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