期刊
JOURNAL OF CATALYSIS
卷 294, 期 -, 页码 161-170出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2012.07.016
关键词
SAPO-11; Cationic surfactants; Chain length; External surface area; Di-branched isomerization
资金
- National Basic Research Program [2010CB226905]
- Program for New Century Excellent Talents in University [NCET-09-0763]
- National Natural Science Foundation of China [21076228]
- Science Foundation of China University of Petroleum, Beijing [KYJJ2012-03-04]
The structure, acidity, and n-octane di-branched isomerization of SAPO-11 synthesized with surfactants of different chain lengths in water-propanol system were investigated. The results showed that with the increasing chain length of surfactants, the crystallite size of SAPO-11 firstly decreased and then increased, but the external surface area and the active B acid sites of SAPO-11 firstly increased and then decreased. The smallest crystallite, the highest external surface area, and the most B acid sites were obtained simultaneously with the surfactant of 12 carbon atoms. The isomerization results of n-octane indicated that among the series Pt/SAPO-11 catalysts, the catalyst with DoTAB-directed SAPO-11 as support had the highest selectivity to di-branched isomers and the lowest cracking selectivity due to the largest external surface area that created more active sites to promote the formation of di-branched isomers by the key-lock mechanism and improve the diffusion of intermediates and products for reducing cracking reactions. (C) 2012 Elsevier Inc. All rights reserved.
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