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Effect of Pd Doping on the Cu 0 /Cu + Ratio of Cu‐Pd/SiO 2 Catalysts for Ethylene Glycol Synthesis from Dimethyl Oxalate
Author(s) -
Zhang Chuancai,
Wang Denghao,
Zhu Mingyuan,
Yu Feng,
Dai Bin
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201600570
Subject(s) - catalysis , ethylene glycol , oxalate , hydrogen spillover , copper , inorganic chemistry , ethylene , sintering , hydrogen , chemistry , selectivity , nuclear chemistry , materials science , organic chemistry
The Cu 0 /Cu + ratio is very important in many copper‐catalyzed reactions. A series of Cu−Pd/SiO 2 catalysts were prepared by composite evaporation of ammonia with subsequent Pd impregnation. The Cu 0 /Cu + ratio could be controlled by changing the Pd content in the catalysts during reduction. The catalysts were applied to the hydrogenation of dimethyl oxalate, and experimental results showed that a suitable amount of Pd doping remarkably improved the activity and prolonged the lifetime of the catalyst. The optimized Cu‐0.5 % Pd/SiO 2 catalyst showed complete conversion with 96.0 % ethylene glycol selectivity over a lifetime of 300 h. Enhancements in the activity and stability of the Cu−Pd/SiO 2 catalysts were ascribed to the stable generation of hydrogen spillover, which tended to adjust the Cu 0 /Cu + ratio with changes in Pd content in the reduced catalysts. Hydrogen spillover also promoted the release of intermediates in contact with Cu + to inhibit copper sintering.