Hierarchical mesoporous ZSM-5 zeolite with increased external surface acid sites and high catalytic performance in o-xylene isomerization

被引：52

作者：

Zhou Jian ^{[1
,2
]}

Liu Zhicheng ^{[1
]}

Li Liyuan ^{[1
]}

Wang Yangdong ^{[1
]}

Gao Huanxin ^{[1
]}

Yang Weimin ^{[1
]}

Xie Zaiku ^{[1
]}

Tang Yi ^{[2
]}

机构：

[1] SINOPEC, Shanghai Res Inst Petrochem Technol, Shanghai 201206, Peoples R China

[2] Fudan Univ, Dept Chem, Shanghai 200433, Peoples R China

来源：

CHINESE JOURNAL OF CATALYSIS | 2013年 / 34卷 / 07期

基金：

中国博士后科学基金;

关键词：

Hierarchical structure; ZSM-5; zeolite; Surface acid site; Catalysis; Xylene isomerization; SINGLE-CRYSTALS; SELECTIVITY; DESILICATION; ALKYLATION;

D O I：

10.1016/S1872-2067(12)60602-0

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Surface acid sites of hierarchical mesoporous ZSM-5 zeolite synthesized by steam-assisted crystallization were characterized by NH3 temperature-programmed desorption and in-situ infrared spectroscopy. Compared with the conventional ZSM-5 zeolite, the hierarchical ZSM-5 zeolite had a lower concentration of surface acid sites. However, the hierarchical structure had more Lewis acid sites and, more importantly, much more external active sites as confirmed by 2,6-di-tert-butylpyridine infrared spectroscopy. Such hierarchical structure exposed more acid sites on the external surface, which subsequently lead to higher catalytic activity in reactions involving bulky molecules, such as o-xylene isomerization. (C) 2013, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.

引用

页码：1429 / 1433

页数：5

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