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Supported palladium–copper catalysts: Preparation and catalytic behavior in hydrogen-related reactions

Paper ID Volume ID Publish Year Pages File Format Full-Text
54686 47020 2014 8 PDF Available
Title
Supported palladium–copper catalysts: Preparation and catalytic behavior in hydrogen-related reactions
Abstract

•Pd–Cu/AlF3 catalysts prepared by co-gelation were probed in n-pentane isomerization.•Pd–Cu/C catalysts prepared by coimpregnation were probed in CCl4 hydrodechlorination.•XRD, TEM and catalytic probes indicate good metal dispersion and alloy homogeneity.•During CCl4 hydrodechlorination carbon incorporates into bulk of Pd75Cu25/C catalyst.

Two series of highly dispersed supported Pd–Cu catalysts were prepared using different supports: highly acidic aluminum fluoride HS-AlF3, characterized by high surface area, and active carbon, both prepared by different preparation methods (fluorolytic sol–gel method and co-impregnation). A variety of techniques: chemisorption of hydrogen, XRD, TEM, and catalytic performance in two hydrogen-related probe reactions (in n-pentane hydroisomerization and CCl4 hydrodechlorination) were employed to probe metal dispersion and the extent of interaction between two metal components. A reasonable degree of bimetal intermixing in Pd–Cu/HS-AlF3 catalysts synthesized by fluorolytic co-gelation was recognized by the catalytic behavior in bifunctional hydroisomerization of n-pentane. A significantly decreased, compared to pure palladium, hydrogenation–dehydrogenation potential of Pd–Cu alloys led to a weaker performance of bimetallic catalysts. Similarly, it was found that incipient wetness co-impregnation of active carbon resulted in the formation of catalysts characterized by good metal dispersion and significant extent of Pd–Cu alloying. Although the monometallic 2 wt% Cu/carbon catalyst is nearly inactive in CCl4 hydrodechlorination, copper addition to palladium in the co-impregnated catalysts had very pronounced effect, vastly increasing the selectivity toward longer than methane hydrocarbons.

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Keywords
Fluorolytic sol–gel process; Pd–Cu/HS-AlF3 catalysts; Pd–Cu/Sibunit carbon catalysts; TEM; XRD; n-Pentane hydroisomerization; CCl4 hydrodechlorination
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Supported palladium–copper catalysts: Preparation and catalytic behavior in hydrogen-related reactions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 235, 15 October 2014, Pages 144–151
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