Alkali-treatment of template-containing MCM-22 zeolite and its application in alkylation and transalkylation reactions

Authors:  Kefeng Liu, Sujuan Xie, Huijuan Wei, Xiujie Li, Shenglin Liu, Longya Xu

Abstract:
The effects of alkali-treatment on the compositions, acidities, texture properties and pore structures of template-containing MCM-22 zeolite were studied by Py-IR, N₂ adsorption–desorption, o-xylene adsorption, XRD and 29Si NMR. When template-containing MCM-22 zeolite was alkali-treated, desilication mainly occurred in the Al-poor regions, which broke the crystal sheets into smaller ones. The alkalitreatment process under the moderate conditions had little influence on the microporous properties and crystal structures of MCM-22 zeolite, but improved the diffusion conditions for aromatics mainly by reducing the crystal size. With the preserved framework Al species, the alkali-treated templatecontaining MCM-22 samples had higher ratio of Brönsted to Lewis acid sites, and exhibited improved catalytic performances in alkylation and transalkylation processes. 

Keywords:
MCM-22 zeolite
Alkali-treatment
Benzene
Alkylation
Transalkylation

Published in: Applied catalysis A: General   (Volume 468, Pages 1-474, 5 November 2013)

Publisher: Elsevier  

ISSN Information: 0926-860X

Alkali-treatment of template-containing MCM-22 zeolite and its application in alkylation and transalkylation reactions

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