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Dehydration of ethyl lactate over alkaline earth phosphates: Performances, effect of water on reaction pathways and active sites

Paper ID Volume ID Publish Year Pages File Format Full-Text
45278 46407 2016 11 PDF Available
Title
Dehydration of ethyl lactate over alkaline earth phosphates: Performances, effect of water on reaction pathways and active sites
Abstract

•Alkaline earth phosphates were evaluated in gas phase dehydration of ethyl lactate.•Selectivity values to acrylic acid and ethyl acrylate reaching 87% were obtained.•Addition of water vapor to the feed slows deactivation of catalysts.•Acrylic acid was mainly formed by a simultaneous dehydration/hydrolysis reaction.•The presence of a surface amorphous layer containing POH species was evidenced.

In this work, alkaline earth phosphates have been prepared by co-precipitation and evaluated in gas phase dehydration of ethyl lactate to acrylic acid and ethyl acrylate. These solids, which were previously shown to be active for the dehydration of lactic acid, appeared more efficient. Indeed, it was shown that the decarbonylation/decarboxylation route leading to acetaldehyde was strongly inhibited compared to conversion of lactic acid and molar selectivity values to dehydration products reaching 87% were obtained. Furthermore, it was shown that the deactivation of the catalysts could strongly be slowed by addition of water vapor to the feed. The reaction pathways have been studied in the presence and absence of water and it was shown that acrylic acid was mainly formed by a simultaneous dehydration/hydrolysis reaction. The characterization of the catalysts surface from the results of XPS, cross polarization NMR, DRIFT and TEM showed the presence of a surface amorphous layer containing POH species. In situ DRIFT measurements have revealed that formation of POH groups was favored under water vapor and that these species interacted with reactants or reaction products at the reaction temperature.

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Keywords
Ethyl lactate; Acrylic acid; Ethyl acrylate; Gas phase dehydration; Alkaline earth phosphates; Surface characterization; Reaction pathways; Water effect
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Dehydration of ethyl lactate over alkaline earth phosphates: Performances, effect of water on reaction pathways and active sites
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 180, January 2016, Pages 596–606
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us