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Investigation of the structural evolution and catalytic performance of the CuZnAl catalysts in the hydrogenation of dimethyl oxalate to ethylene glycol

Paper ID Volume ID Publish Year Pages File Format Full-Text
54320 47005 2014 10 PDF Available
Title
Investigation of the structural evolution and catalytic performance of the CuZnAl catalysts in the hydrogenation of dimethyl oxalate to ethylene glycol
Abstract

•CuZnAl used in the hydrogenation of DMO to EG.•Investigation of copper content and calcination temperature.•Higher content of the copper induce the Cu aggregation.•CZA773 displays the optimal activity.•CZA 1-4-5 shows the best catalytic performance.

A series of CuZnAl catalysts are synthesized and investigated to study the catalytic performance in the gas-phase hydrogenation of dimethyl oxalate to ethylene glycol. The catalytic activity increases with the increasing of the copper loading, but much higher copper content in the catalysts will lead to the aggregation of the copper particles and cause the deactivation of the catalysts. The influence of calcination temperature is also investigated to probe the microstructure evolution of the catalysts. The catalysts calcinated at low temperature display weak metal-support interaction with poor reducibility and exhibit poor catalytic activity. When the calcination temperature was risen up to temperature higher than 873 K, the mesoporous structure of the support is collapsed or sintered which further lead to the low dispersion of the copper species and poor catalytic property. The catalyst with molar ratio of copper: zinc: aluminium as 1/4/5 (CZA1-4-5) calcinated at 773 K shows the best catalytic performance and can keep the high activity for more than 200 h of time on stream, both the conversion and the selectivity to EG still remain unchanged.

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Keywords
CuOZnOAl2O3 catalyst; Dimethyl oxalate; Ethylene glycol; Catalytic hydrogenation; Structural evolution
First Page Preview
Investigation of the structural evolution and catalytic performance of the CuZnAl catalysts in the hydrogenation of dimethyl oxalate to ethylene glycol
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 233, 15 September 2014, Pages 117–126
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis