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The enantioselective hydrogenation of (E)-α-phenylcinnamic acid: Role of TiO2 coated on Al2O3 as a novel support for cinchonidine-modified Pd catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
49705 46763 2015 4 PDF Available
Title
The enantioselective hydrogenation of (E)-α-phenylcinnamic acid: Role of TiO2 coated on Al2O3 as a novel support for cinchonidine-modified Pd catalysts
Abstract

•Titania/alumina hybrids are synthesized by coating TiO2 onto Al2O3 template.•The TiO2 wt.% loadings effectively alter the textural structure of the hybrids.•The TiO2/Al2O3 mix oxides are used as supports for Pd-based catalysts.•The Pd-based catalysts are first used for the enantioselective hydrogenation of PCA.•Textural structure of the supports has a critical effect on the enantiomeric excess.

The TiO2-coated Al2O3 composites with various TiO2 wt.% loadings were synthesized by the sol–gel method and were used as supports for the Pd-based catalysts to evaluate the enantiomeric excess (ee) of the hydrogenation of (E)-α-phenylcinnamic acid. The physicochemical properties of the composites and the Pd-based catalysts were characterized. The results reveal the strong influence of the TiO2 wt.% loading on the ee value, which is attributed to the effect of pore diffusion. The 5%TiO2/Al2O3 support, which can diminish most of small mesopores in Al2O3 template while remain most of large mesopores, exhibits the highest ee. Our results demonstrate the promising application of mixed oxides as novel supports to improve ee values of the asymmetric hydrogenation of unsaturated prochiral compounds.

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Keywords
TiO2/Al2O3 composites; Sol–gel method; Pd-based catalysts; (E)-α-phenylcinnamic acid; Asymmetric hydrogenation
First Page Preview
The enantioselective hydrogenation of (E)-α-phenylcinnamic acid: Role of TiO2 coated on Al2O3 as a novel support for cinchonidine-modified Pd catalysts
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 66, 5 June 2015, Pages 21–24
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis