期刊
JOURNAL OF CATALYSIS
卷 314, 期 -, 页码 159-169出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2014.04.006
关键词
Methanol-to-hydrocarbons conversion; Alkene methylation; Density functional theory; Micro-kinetic modeling; Temporal analysis of products; Reaction pathway; Zeolite catalysis; ZSM-22
资金
- U.S. Department of Energy Chemical Sciences, Geosciences and Biosciences Division [DE-AC02-76SF00515]
- National Science Foundation Graduate Research Fellowship
- Norwegian Research Council [174893]
- Nordic Research Opportunity [DGE-1147470]
Research on zeolite-catalyzed methanol-to-hydrocarbons (MTH) conversion has long been concerned with the mechanism of the reaction between methanol and alkenes. Two pathways have been debated: (1) the stepwise, proceeding through a surface-methoxy intermediate and (2) the concerted, in which the alkenes react directly with methanol. This work addresses the debate through micro-kinetic modeling based on density functional theory calculations of both pathways, as well as experiments employing temporal analysis of products to investigate the kinetics of the stepwise pathway for a series of alkenes in HZSM-22 zeolite. The model predicts the stepwise pathway to prevail at typical MTH reaction temperatures, due to a higher entropy loss in the concerted as compared to the stepwise pathway. The entropy difference results from intermediate release of water in the stepwise pathway. These findings lead us to suggest that the stepwise pathway should also be considered when modeling MTH conversion in other zeolites. (c) 2014 Elsevier Inc. All rights reserved.
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