Alkali-treatment of template-containing MCM-22 zeolite and its application in alkylation and transalkylation reactions
Alkali-treatment of template-containing MCM-22 zeolite and its application in alkylation and transalkylation reactions
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DOI：
10.1016/j.apcata.2013.09.009
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发表时间：
2013-11-05
影响因子：
5.5
通讯作者：
Xu, Longya
中科院分区：
文献类型：
--
作者：
Liu, Kefeng;Xie, Sujuan;Xu, Longya
采用Py-IR、N-2吸附-脱附、邻二甲苯吸附、X射线衍射和硅-29核磁共振等手段研究了碱处理对含模板剂MCM-22分子筛的组成、酸性、织构性质和孔结构的影响。含模板剂的MCM-22沸石经碱处理后，脱硅主要发生在贫铝区域，使晶片破碎成较小的片晶。温和条件下的碱处理工艺对MCM-22分子筛的微孔性能和晶体结构影响不大，但主要是通过减小晶体尺寸改善了芳烃的扩散条件。在保留骨架铝物种的情况下，碱处理模板剂MCM-22具有更高的Bronsted/Lewis酸位比，在烷基化和烷基转移过程中表现出更好的催化性能。(C)2013爱思唯尔B.V.保留所有权利。
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, N-2 adsorption-desorption, o-xylene adsorption, XRD and Si-29 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 alkali-treatment 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 template-containing MCM-22 samples had higher ratio of Bronsted to Lewis acid sites, and exhibited improved catalytic performances in alkylation and transalkylation processes. (C) 2013 Elsevier B.V. All rights reserved.