期刊
JOURNAL OF CATALYSIS
卷 364, 期 -, 页码 262-270出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2018.05.010
关键词
Zeolites; Shape selectivity; Micromesoporous structure; ZSM-5; Mordenite (MOR); Isomerization of hexane; Desilication; Dealumination
资金
- Grant Agency of the Czech Republic [GA15-12113S]
- Research Infrastructures NanoEnviCz [LM2015073]
- NanoEnviCz [CZ.02.1.01/0.0/0.0/16_013/0001821]
- Ministry of Education, Youth and Sports of the Czech Republic
The large mesoporous surfaces of hierarchical zeolites without confinement of the active sites leads to the question of whether the shape selectivity of these zeolites is essentially altered. The hydroisomerization of n-hexane to mono- and dibranched C-6 isomers was carried out as a model reaction governed by the shape selectivity to obtain insight into the effects of the secondary mesoporous structure. A series of micro- and micromesoporous ZSM-5, MOR, *BEA, and Y zeolites with regular microporosity or well developed mesoporosity were prepared by synthesis and postsynthesis treatment, and their selectivity was investigated. We demonstrate that isomerization is exclusively controlled by concurrent interaction of the reactant with the Brensted site and the inner walls of the zeolite channels, irrespective of the mesoporosity. The reaction is facilitated only by a combination of dispersive forces in the inert void and acid sites in the confined environment. The shape selectivity of micromesoporous zeolites is thus fully preserved. (C) 2018 Elsevier Inc. All rights reserved.
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