Journal
CHINESE JOURNAL OF CATALYSIS
Volume 34, Issue 7, Pages 1429-1433Publisher
SCIENCE PRESS
DOI: 10.1016/S1872-2067(12)60602-0
Keywords
Hierarchical structure; ZSM-5 zeolite; Surface acid site; Catalysis; Xylene isomerization
Funding
- National Basic Research Program of China (973 Program) [2009CB623506]
- China Postdoctoral Science Foundation [2012M510101]
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure [SKL201208SIC]
- Shanghai Postdoctoral Scientific Program [12R21422000]
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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.
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