Journal
JOURNAL OF CATALYSIS
Volume 288, Issue -, Pages 115-123Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2012.01.009
Keywords
Nanocrystalline zeolite; Hierarchical zeolite; Acidity; Dealumination; Hydrothermal stability; Steaming; MTG; Cracking
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Funding
- Korea Institute of Geoscience and Mineral Resources (KIGAM)
- Ministry of Knowledge Economy of Korea
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [20110011392]
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The distribution, acid strength, and steam stability of internal and external acid sites were systematically investigated for nanocrystalline MFI zeolites with different crystallite size (2-300 nm), which were obtained using gemini-surfactants having different alkyl chain lengths. FT-IR spectroscopy using pyridine and 2,6-di-tert-butylpyridine as a base probe revealed that the concentration of external acid sites increased with a decreasing crystallite size. The external sites were weaker than the internal sites in acid strength, but could still catalyze n-octane cracking reactions that require the strongest acid strength among various acid-catalyzed reactions. Most notably, the external acid sites of zeolites exhibited remarkably higher steam stability at 873 K than the internal acid sites. Such an observation was supported by the catalytic results in methanol to dimethylether (DME) and gasoline conversion, and the Claisen-Schmidt condensation involving bulky molecules. (C) 2012 Elsevier Inc. All rights reserved.
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