期刊
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
卷 88, 期 -, 页码 127-136出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2020.03.037
关键词
Glycerol dehydration; Acrolein; ZSM-5 zeolites; b-Axis channels; Diffusion
资金
- National Natural Science Foundation of China [21676155]
Glycerol dehydration to value-added acrolein over zeolite catalysts is a useful approach to offer a sustainable economic route for the biodiesel industry. Glycerol dehydration over H-ZSM-5 with conventional morphology often exhibits a significant mass transfer limitation and inhibits the access to active sites in the micropores, which causes low activity, selectivity, and severe catalyst deactivation. In this study, a significant impact of b-axis channel length on acrolein selectivity and catalyst activity was revealed by using H-ZSM-5 synthesized with varied channel length in b-axis of 60, 130,180, and 250 nm. Complete glycerol conversion and high acrolein selectivity (88%) were observed over H-ZSM-5 with 60 nm channels length in b-axis, due to high availability of active sites and enhanced diffusion through the shortest channels, which dramatically suppressed the coke formation. The catalysts with long b-axis channels exhibited a slow internal diffusion, leading to increased polymerization side reactions and coke formation. (C) 2020 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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