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Selective hydrogenation of phenylacetylene over bimetallic Pd–Cu/Al2O3 and Pd–Zn/Al2O3 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
53294 46962 2016 7 PDF Available
Title
Selective hydrogenation of phenylacetylene over bimetallic Pd–Cu/Al2O3 and Pd–Zn/Al2O3 catalysts
Abstract

•Bimetallic Pd–Cu/Al2O3 and Pd–Zn/Al2O3 exhibited enhanced selectivity to styrene.•The Cu/Pd and Zn/Pd molar ratios affected the activity and selectivity of catalyst.•The geometric effect resulted in increased selectivity to styrene of Pd–Cu/Al2O3.•Both geometric and electronic effects led to increased selectivity of Pd–Zn/Al2O3.•Pd–Zn/Al2O3 with a Zn/Pd molar ratio of 6 showed the best selectivity to styrene.

Bimetallic Pd–Cu/Al2O3 and Pd–Zn/Al2O3 catalysts with various Cu/Pd and Zn/Pd molar ratios were prepared and applied to the selective hydrogenation of phenylacetylene to styrene. The structure properties of the bimetallic catalysts were characterized by inductively coupled plasma–optical emission spectroscopy (ICP–OES), CO chemisorption, high-resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). Different from Pd–Cu/Al2O3 where the interaction between Pd and Cu only generated the geometric effect, both geometric and electronic effects were observed for Pd–Zn/Al2O3. The activity and selectivity of the bimetallic catalysts can be tuned by varying the Cu/Pd and Zn/Pd molar ratios, which were essentially determined by the geometric and electronic effects of the catalysts. Although both Pd–Cu/Al2O3 and Pd–Zn/Al2O3 exhibited improved selectivity to styrene compared to monometallic Pd/Al2O3, there is a difference in the activity and selectivity between the two types of bimetallic catalysts at the same Cu/Pd and Zn/Pd molar ratio, which is mainly caused by the different modification degrees of Cu and Zn on Pd. Among all the catalysts prepared in this work, the Pd–Zn/Al2O3 with a Zn/Pd molar ratio of 6 displayed the best selectivity to styrene, being 86.3% at 99.5% phenylacetylene conversion.

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Keywords
Selective hydrogenation; Phenylacetylene; Pd–Cu/Al2O3; Pd–Zn/Al2O3; Activity; Selectivity
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Selective hydrogenation of phenylacetylene over bimetallic Pd–Cu/Al2O3 and Pd–Zn/Al2O3 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 264, 15 April 2016, Pages 37–43
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