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Dehydration of 1,2-propanediol to propionaldehyde over zeolite catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41336 45885 2011 8 PDF Available
Title
Dehydration of 1,2-propanediol to propionaldehyde over zeolite catalysts
Abstract

Dehydration of 1,2-propanediol has been investigated over a range of zeolite catalysts with different pore structures and acidity. The reaction forms part of a two-step process for the conversion of glycerol to propionaldehyde. The effects of reaction temperature, concentration, space velocity, and SiO2/Al2O3 ratio have been studied. The medium pore size, unidirectional channel zeolites ZSM-23 and Theta-1 showed high activity and selectivity to propionaldehyde (exceeding 90 wt% at 300–350 °C). Selectivity to the intermolecular dehydration product 2-ethyl-4-methyl-1,3-dioxolane was high at lower temperatures for all the zeolites, but decreased to a low value at higher temperatures and lower GHSV. The results are discussed in relation to the reaction mechanism and zeolite structures. Significant deactivation was observed for higher 1,2-propanediol partial pressures, which was partially mitigated by the addition of steam.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (119 K)Download as PowerPoint slideHighlights► 1,2-propanediol is a potential intermediate in a two-step process for conversion of glycerol to propionaldehyde. ► Zeolites show high activity for 1,2-propanediol dehydration. ► Medium pore size, unidirectional channel zeolites are very selective to propionaldehyde. ► Selectivity to propionaldehyde over ZSM-23 and Theta-1 was >90% at 300–350 °C. ► Catalyst deactivation was partially mitigated by steam addition.

Keywords
1,2 Propanediol; Dehydration; Propionaldehyde; Glycerol; Zeolite; Catalyst
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Dehydration of 1,2-propanediol to propionaldehyde over zeolite catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 400, Issues 1–2, 30 June 2011, Pages 148–155
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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