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Hydrogenation of cinnamaldehyde over Pt/RHCs in supercritical carbon dioxide – Influence of support pretreatment and phase behavior

Paper ID Volume ID Publish Year Pages File Format Full-Text
52388 46872 2008 6 PDF Available
Title
Hydrogenation of cinnamaldehyde over Pt/RHCs in supercritical carbon dioxide – Influence of support pretreatment and phase behavior
Abstract

The selective hydrogenation of cinnamaldehyde (CAL) was investigated using rice husk-based porous carbon (RHCs) supported platinum catalysts in supercritical carbon dioxide (scCO2). The effects of surface chemistry treatment of the support and the reaction phase behavior have been examined. The Pt/H–RHCs (HNO3-pretreated) was more active for CAL hydrogenation compared with Pt/NH3–RHCs (NH3 · H2O-pretreated). The Pt/RHCs catalyst exhibited a higher selectivity to cinnamyl alcohol (COL) compared with commercial catalyst of Pt/C, which is relative to the micro–mesoporosity structure of the RHCs. Under the reaction conditions, the product distribution changes markedly with the variation of the phase behavior. A higher selectivity to hydrocinnamyl alcohol of 90% was obtained in two-phase reaction system of CO2–riched gas phase (CO2, H2, dissolved cinnamaldehyde) and solid phase (catalyst); while, the main product changed to cinnamyl alcohol with a selectivity of 88% in three-phase reaction system of CO2–riched gas phase (CO2, H2, dissolved cinnamaldehyde), cinnamaldehyde–riched liquid phase (cinnamaldehyde, dissolved CO2 and H2) and solid phase (catalyst). It is attributed to the influence of the molecule interactions and the substrate concentration effects.

Keywords
Selective hydrogenation; Cinnamaldehyde; Supercritical carbon dioxide; Rice husk-based porous carbon; Chemical treatment
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Hydrogenation of cinnamaldehyde over Pt/RHCs in supercritical carbon dioxide – Influence of support pretreatment and phase behavior
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 9, Issue 1, January 2008, Pages 140–145
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