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A multiphase reaction medium including pressurized carbon dioxide and water for selective hydrogenation of benzonitrile with a Pd/Al2O3 catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
40537 45857 2013 8 PDF Available
Title
A multiphase reaction medium including pressurized carbon dioxide and water for selective hydrogenation of benzonitrile with a Pd/Al2O3 catalyst
Abstract

•Water and CO2 are useful for selective hydrogenation of nitrile to primary amine.•Water suppresses the reaction between primary amine and imine intermediate.•Water prevents the catalyst from being deactivated by carbamate accumulation.•CO2 molecules interact with cyano group of benzonitrile decreasing its reactivity.

The hydrogenation of benzonitrile was studied with a Pd/Al2O3 catalyst in the presence of pressurized CO2 and water. This multiphase reaction system was effective for the selective production of the desired primary amine of benzylamine with no deactivation of the catalyst. The enhanced selectivity to the primary amine resulted from its transfer into water phase, which prevented the primary amine from reacting with an intermediate of imine into the secondary amine in the organic phase (benzonitrile). In addition, interactions of CO2 molecules with the primary amine could also increase its selectivity. In the absence of water, the catalyst was deactivated by the accumulation of a carbamate salt on the surface of catalyst. But this deactivation was avoided by the addition of water because the salt was soluble in water and it did not deposit on the catalyst existing at interfacial layer between the water and organic phases.

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Keywords
Benzonitrile; Selective hydrogenation; Carbon dioxide; Water; Multiphase reaction
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A multiphase reaction medium including pressurized carbon dioxide and water for selective hydrogenation of benzonitrile with a Pd/Al2O3 catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 456, 10 April 2013, Pages 215–222
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