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Study on the influence of channel structure properties in the dehydration of glycerol to acrolein over H-zeolite catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
40904 45870 2012 8 PDF Available
Title
Study on the influence of channel structure properties in the dehydration of glycerol to acrolein over H-zeolite catalysts
Abstract

Systematic studies have been conducted over several selected H-zeolites, namely HZSM-5, H-Beta, HY, nano HZSM-5, HZSM-11 and nano HZSM-11, aimed to investigate influence of the channel structure on catalytic performance for gas phase dehydration of glycerol to acrolein. Compared to H-Beta and HY, improved catalytic performance was discovered over HZSM-5, which demonstrated that H-zeolites with smaller channels, the ones marginally larger than the molecular diameter of glycerol, were preferential for the reaction. HZSM-11, with lower channel complexity, was more likely to obtain superior catalytic performance due to enhanced diffusion. Nano HZSM-11 (300–500 nm) exhibited excellent catalytic performance with 81.6 mol% glycerol conversion and 74.9 mol% acrolein selectivity at GHSV as high as 873 h−1 (TOS = 8 h). BET and TEM experiment results indicated that coke was initially deposited at channel intersections of H-zeolites, and when the channel blockage came up to a certain extent, there arrived the onset of coke deposition on the external surface.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (152 K)Download as PowerPoint slideHighlights► H-zeolites with smaller channels favored glycerol dehydration to acrolein. ► HZSM-11 exhibited superior catalytic performance than HZSM-5. ► The introduction of carrier gas could improve catalytic performance of H-zeolites. ► Coke was initially deposited at channel intersections of H-zeolites. ► External surface of H-zeolites supplied room for coke deposition during reaction.

Keywords
Glycerol; Acrolein; Dehydration; Channel structure property; HZSM-11
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 429–430, 2 July 2012, Pages 9–16
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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Any Questions? feel free to contact us