期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 165, 期 -, 页码 148-157出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2012.07.045
关键词
Hierarchical ZSM-5; Mesoporous ZSM-5; Surfactant assisted desilication; Methanol to hydrocarbon; Improved catalytic lifetime
类别
资金
- Max-Buchner-Forschungsstiftung
Hierarchical ZSM-5 zeolites were synthesized by alkaline desilication and a surfactant induced re-assembly. Contrary to the purely alkaline desilicated zeolites a strong increase in external surface area, a narrow pore size distribution of 3-10 nm and a decreased Bronsted acidity could be achieved when using CTAB as a surfactant throughout the alkaline treatment. The hierarchical pore system and the decreased acidity lead to an improved catalyst lifetime in the methanol to hydrocarbon conversion. A further improvement could be accomplished by increasing the surfactant concentration during the desilication re-assembly preparation. Tailoring of mesopore size and specific surface area was achieved using surfactants with different chain lengths. (C) 2012 Elsevier Inc. All rights reserved.
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