Citation: Guangxian Pei, Xiaoyan Liu, Mengqian Chai, Aiqin Wang, Tao Zhang. Isolation of Pd atoms by Cu for semi-hydrogenation of acetylene:Effects of Cu loading[J]. Chinese Journal of Catalysis, ;2017, 38(9): 1540-1548. doi: 10.1016/S1872-2067(17)62847-X shu

Isolation of Pd atoms by Cu for semi-hydrogenation of acetylene:Effects of Cu loading

a State Key Laboratory of Catalysis, Collaborative Innovation Center of Chemistry for Energy Materials(iChEM), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
b University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 31 March 2017
Revised Date: 30 April 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (21303194, 21476227, 21522608 and 21690084), Youth Innovation Promotion Association of the Chinese Academy of Sciences (2014163), the National Key Projects for Fundamental Research and Development of China (2016YFA0202801), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB17020100), and the department of sci-ence and technology of Liaoning province under contract of 2015020086-101.

Cu-alloyed Pd single-atom catalysts exhibit excellent catalytic performance for the semi-hydrogenation of acetylene; however, the limit of the Cu/Pd atomic ratio for forming the al-loyed Pd single-atom catalyst is ambiguous. Herein, silica-supported Cu-Pd bimetallic catalysts with fixed Pd content and varied Cu loadings were synthesized using an incipient wetness co-impregnation method. The X-ray absorption spectroscopy results indicated that Pd formed an alloy with Cu after reduction at 250℃ and that the Pd atoms were completely isolated by Cu for Cu/Pd atomic ratios ≥ 40/1. Notably, increasing the reduction temperature from 250 to 400℃ hardly affected the catalytic performances of the Cu-Pd/SiO₂ catalysts. This finding can be attribut-ed to the similar chemical environments of Pd demonstrated by the X-ray absorption spectroscopy results.
- Copper,
- Palladium,
- Single-atom catalyst,
- X-ray absorption spectroscopy,
- Acetylene hydrogenation,
- Excess ethylene
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