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Preparation of Pd/C designed for chiral modified catalyst: Comparison with Pd/TiO2 in enantioselective hydrogenation of α-phenylcinnamic acid

Paper ID Volume ID Publish Year Pages File Format Full-Text
40841 45868 2012 6 PDF Available
Title
Preparation of Pd/C designed for chiral modified catalyst: Comparison with Pd/TiO2 in enantioselective hydrogenation of α-phenylcinnamic acid
Abstract

Enantioselective hydrogenation of α-phenylcinnamic acid was investigated on Pd/C catalysts prepared in our laboratory to compare activity and selectivity with those on commercial Pd/C and Pd/TiO2 catalysts. The Pd/C catalysts after the 353 K-H2-pretreatment exhibited satisfactory and comparable performances obtained with commercially available best ever Pd/C by optimizing catalyst preparation. In contrast to Pd/TiO2, a high loading of Pd is not necessary with Pd/C, but only 5% loading on a certain activated carbon was found to result in high e.e. It is suggested that the optimum size or size-distribution of Pd metal particle are different between the two supports, suggesting a support effect of this catalyst system.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (125 K)Download as PowerPoint slideHighlights► Cinchonidine-modified catalysts were prepared with eggshell and homogeneous Pd/C. ► Optimized loading of Pd on the carbon was only 5%. ► The best prepared Pd/C showed identical performance with the commercial best Pd/C. ► The H2-pretreatment prior to the CD-modification was also effective for the freshly prepared catalyst. ► The properties of Pd/C in enantioselective hydrogenation were different from those of Pd/TiO2.

Keywords
Pd/C, palladium supported on activated carbon; Pd//TiO2, palladium supported on rutile titania; CD, cinchonidine; PCA, phenylcinnamic acid; % e.e., enantiomer excess of product in percent; r0, reaction rate evaluated by the hydrogen uptake at a 25% conver
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Preparation of Pd/C designed for chiral modified catalyst: Comparison with Pd/TiO2 in enantioselective hydrogenation of α-phenylcinnamic acid
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 437–438, 26 September 2012, Pages 18–23
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