期刊
JOURNAL OF CATALYSIS
卷 285, 期 1, 页码 251-259出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2011.09.037
关键词
Hierarchical silicoaluminophosphate; Alkylphosphonic acid; Mesopore; Isomerization
资金
- National Basic Research Program of China [2010CB226905]
- Program for New Century Excellent Talents in University [NCET-09-0763]
- National Natural Science Foundation of China [21076228, 20825621]
- Nova Program of Beijing [20078073]
This article proposes a one-step strategy to hydrothermally synthesize SAPO-11 with hierarchical micro- and meso-porous structure. The structure and acidity properties and the isomerization performance of the resulting hierarchical SAPO-11 were extensively characterized and assessed, respectively, and compared with those of a microporous SAPO-11. The results showed that the SAPO-11 with mutually interpenetrating micropores and mesopores had been obtained by introducing tetradecylphosphoric acid into the synthesis system of microporous SAPO-11. Compared with microporous SAPO-11, the hierarchical SAPO-11 had much higher external surface and mesoporous volume, and more active sites with suitable Bronsted acid strength. These advantages endowed the hierarchical SAPO-11-based catalyst with superior isomerization activity, enhanced selectivity to di-branched products, and decreased cracking selectivity. The strategy proposed opens a new route to synthesizing a variety of hierarchical mesoporous SAPO molecular sieves for size-selective catalytic conversions of relatively large hydrocarbon molecules. (C) 2011 Elsevier Inc. All rights reserved.
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