期刊
JOURNAL OF CATALYSIS
卷 271, 期 2, 页码 186-194出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2010.01.012
关键词
MTO; MCM-22 and ITQ-2; Pore architecture; Acidity; Product selectivities and deactivation stability
资金
- Korea Science and Engineering Foundation through the National Research Laboratory [R0A-2007-000-20050-0]
- SK Energy
- National Research Foundation of Korea [R0A-2007-000-20050-0, 2007-0056805] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The methanol-to-olefin (MTO) performance of H-MCM-22 and H-ITQ-2, as well as of their dealuminated analog prepared via oxalic acid treatment, is compared with the catalytic behavior of H-ZSM-5 and H-SAPO-34. The contribution of two-dimensional sinusoidal 10-ring channels in H-MCM-22 to the overall catalytic action of this medium-pore zeolite, especially to the propene selectivity, was found to be considerably greater than that of its cylindrical supercages, probably due to the smaller void volume and hence to the higher concentration of intrazeolitic reactant molecules. Despite the much larger cage volume (480 vs. 240 angstrom(3)), H-MCM-22 shows a much slower deactivation rate than H-SAPO-34. A similar result, although less pronounced, can be observed when compared to the channel-based H-ZSM-5 zeolite with a slightly lower Si/Al ratio (14). The overall results of our study demonstrate that not only the pore architecture (cage-based vs. channel-based pore systems) of zeolitic materials but also the properties (density, strength, and location) of their acid sites are a critical factor governing the MTO selectivity and stability. (C) 2010 Elsevier Inc. All rights reserved.
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