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

doi:10.1016/S1872-2067(17)62847-X

Abstract

Abstract:

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.

Key words: Copper, Palladium, Single-atom catalyst, X-ray absorption spectroscopy, Acetylene hydrogenation, Excess ethylene

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.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(17)62847-X

https://www.cjcatal.com/EN/Y2017/V38/I9/1540

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