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Synergetic effect between Cu0 and Cu+ in the Cu-Cr catalysts for hydrogenolysis of glycerol

Paper ID Volume ID Publish Year Pages File Format Full-Text
54263 47003 2014 8 PDF Available
Title
Synergetic effect between Cu0 and Cu+ in the Cu-Cr catalysts for hydrogenolysis of glycerol
Abstract

•Cu-Cr catalysts were prepared by an epoxide-assisted sol–gel route.•Synergetic effect between the Cu0 and Cu+ was found in glycerol hydrogenolysis.•CuCr2O4 was presented as “hydrogen delivery bridge” in glycerol hydrogenolysis.

Active species of Cu-Cr catalysts, prepared by an epoxide-assisted sol–gel route, were investigated for the hydrogenolysis of glycerol to 1,2-propanediol. Structural characterization of the catalysts was performed by means of N2 physisorption, X-ray diffraction, H2-temperature programmed reduction, high-resolution X-ray photoelectron spectroscopy, NH3-temperature programmed desorption, and N2O titration. On the basis of the characterizations, the copper species on the calcined Cu-Cr catalysts and the reduced Cu-Cr catalysts were assigned. Combined with reaction results, it was found that there was not similar trend in copper metal surface area and glycerol conversion, indicating that a two-site (Cu0 and Cu+) mechanism existed in the hydrogenolysis of glycerol over Cu-Cr catalysts. Besides, the maximum conversion of glycerol was obtained when the surface Cu0/Cu+ ratio increased from 3.1 to 6.6, whereas decreased with increasing sequentially to 15.7, demonstrating that the appropriate surface Cu0/Cu+ ratio was required for optimum hydrogenation activity. Thus, the synergetic effect between the Cu0 and Cu+ was considered to be responsible for the high catalytic activity in the hydrogenolysis of glycerol, and that CuCr2O4 played a critical role in the glycerol hydrogenolysis reaction since it could function as a “hydrogen delivery bridge”.

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Keywords
Cu-Cr catalysts; Glycerol hydrogenolysis; 1,2-Propanediol; Synergetic effect
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 234, 1 October 2014, Pages 200–207
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
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Full-text PDF Download
Online Support
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