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Pt nanoparticles entrapped in Al2O3@SBA-15 composites: Effective and recyclable catalysts for enantioselective hydrogenation of ethyl 2-oxo-4-phenylbutyrate

Paper ID Volume ID Publish Year Pages File Format Full-Text
39491 45825 2014 10 PDF Available
Title
Pt nanoparticles entrapped in Al2O3@SBA-15 composites: Effective and recyclable catalysts for enantioselective hydrogenation of ethyl 2-oxo-4-phenylbutyrate
Abstract

•Al2O3@SBA-15 composites prepared by different methods to support Pt nanoparticles.•Pt/Al2O3@SBA-15 catalyst is effective for chiral hydrogenation of α-ketoesters.•Catalysts are more efficient than Pt/Al2O3 catalyst under the similar conditions.•Catalysts can be reused for at least seven times in acetic acid.•Up to 11,928 h−1 TOF was achieved with Pt/Al2O3@SBA-15 catalyst.

Solid-state grinding, ultrasonic impregnation and conventional impregnation methods were adopted to synthesize mesoporous composites Al2O3@SBA-15 supported Pt catalysts for chiral hydrogenation of ethyl 2-oxo-4-phenylbutyrate after modified with cinchonidine. Compared with Pt/SBA-15 or Pt/alumina catalyst, Pt/Al2O3@SBA-15 catalysts afforded better results when alumina loading in Al2O3@SBA-15 composites reached above 15 wt.%. Nevertheless, the catalytic performance of Pt/Al2O3@SBA-15 catalysts was affected by preparation methods for Al2O3@SBA-15 composites. Ultrasonic impregnation of SBA-15 with an aqueous solution of aluminum nitrate led to uniformly dispersed Al2O3@SBA-15 composites and then enhanced the interaction between SBA-15 silica and alumina. Correspondingly, the Pt/Al2O3@SBA-15 catalyst prepared by this method showed the best results (up to 11,928 h−1 TOF and 87.9% ee) and could be reused for several times. Based on the spectroscopic characterizations, we deduced that the acidity of the composites, the Pt particle size and dispersion, and the electronic properties of Pt particles played vital roles in determining the catalytic performance.

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Keywords
Enantioselective hydrogenation; Ethyl 2-oxo-4-phenylbutyrate; Pt catalyst; Cinchonidine; Al2O3@SBA-15 composites; Ultrasonic impregnation
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Pt nanoparticles entrapped in Al2O3@SBA-15 composites: Effective and recyclable catalysts for enantioselective hydrogenation of ethyl 2-oxo-4-phenylbutyrate
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 488, November 2014, Pages 48–57
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