期刊
JOURNAL OF CATALYSIS
卷 271, 期 2, 页码 201-208出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2010.01.017
关键词
HZSM-5; Aromatization; Oxygenates conversion; Aldehyde conversion; Aldol condensation; Deoxygenation; Biofuels
资金
- National Science Foundation [EPSCoR 0814361]
- US Department of Energy [DE-FG36GO88064]
- Oklahoma Secretary of Energy
- Oklahoma Bioenergy Center
The reactivities of propanal and propylene have been compared over HSZM-5 zeolites (Si/Al = 45 and 25). Propanal is found to be much more reactive than propylene and to form mostly 2-methyl-2-pentenal and C-9 aromatics as early products in the reaction network. Propylene, in contrast, requires more severe conditions to form C-6 and C-7 aromatics. It is proposed that propanal undergoes acid-catalyzed aldol condensation to form 2-methyl-2-pentenal. This dimer undergoes further condensation to form the aldol trimer, which subsequently dehydrates and cyclizes into C-9 aromatics. In contrast, it is well known that propylene, like other olefins, undergoes aromatization via oligomerization and formation of a hydrocarbon pool. While in the conversion of propanal, propylene is also produced, it appears that it does not play a major role in the formation of aromatics under conditions of shorter space times and lower temperatures, at which propanal produces aromatics in significant amounts. (C) 2010 Elsevier Inc. All rights reserved.
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