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Amination of allyl alcohol to propionitrile over a Zn30Cr4.5/γ-Al2O3 bimetallic catalyst via coupled dehydrogenation–hydrogenation reactions

Paper ID Volume ID Publish Year Pages File Format Full-Text
40046 45843 2013 9 PDF Available
Title
Amination of allyl alcohol to propionitrile over a Zn30Cr4.5/γ-Al2O3 bimetallic catalyst via coupled dehydrogenation–hydrogenation reactions
Abstract

•Zn30Cr4.5/γ-Al2O3 showed good performance on the amination of allyl alcohol to propionitrile.•The hydrogen derived from dehydrogenation in situ acted as a source for hydrogenation.•Chromium could diminish the size of ZnAl2O4 crystallites.•The performance of the catalyst can be recovered on line by combustion.

A Zn30Cr4.5/γ-Al2O3 bimetallic catalyst that can perform coupled dehydrogenation and hydrogenation reactions was prepared for the amination of allyl alcohol to propionitrile. During the catalysis, the hydrogen derived from the dehydrogenation of the alcohol and imine acted as an in situ source for the hydrogenation of the carbon-carbon double bond. The catalyst exhibited good performance for the reaction at atmospheric ammonia pressure. The parameters that affect the catalyst performance were studied thoroughly, and an optimized process for synthesizing propionitrile from allyl alcohol and ammonia over the catalyst was obtained. Under the optimized conditions, the propionitrile yield was greater than 65%. The characterization results indicated that the dehydrogenation reaction mainly occurred on the Lewis acid sites and revealed that ZnAl2O4 is the active species for the coupled dehydrogenation–hydrogenation reactions. Chromium doping of the γ-Al2O3-supported zinc catalyst Zn30/γ-Al2O3 resulted in a decrease in the size of the ZnAl2O4 crystallites, which was favorable for the dehydrogenation–hydrogenation reactions. The characterization results also revealed that the catalyst deactivation was due to carbon deposition on the catalyst during the catalytic run. The catalyst could be reactivated by blowing air into the reactor at a high temperature.

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Keywords
Allyl alcohol; Amination; Propionitrile; Bimetallic catalyst; Zn30Cr4.5/γ-Al2O3
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Amination of allyl alcohol to propionitrile over a Zn30Cr4.5/γ-Al2O3 bimetallic catalyst via coupled dehydrogenation–hydrogenation reactions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 467, 2 October 2013, Pages 154–162
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