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Indexed by:期刊论文

Date of Publication:2022-06-30

Journal:Jingxi Huagong/Fine Chemicals

Volume:38

Issue:10

Page Number:2072-2080

ISSN No.:1003-5214

Abstract:A series of PdZnx/Al2O3 bimetallic catalysts with different molar ratios of Pd to Zn were prepared in a controlled manner by strong electrostatic adsorption for the selective hydrogenation of 1,4-butynediol (BYD), and the effect of Zn on the catalytic hydrogenation was investigated. It was found that introducing a small amount of Zn was able to maintain high activity of the catalyst and greatly improve its selectivity for the intermediate cis-1,4-butenediol (cis-BED). PdZn2/Al2O3 catalyst exhibited high catalytic activity with 91% conversion and selectivity for cis-BED (86%) under the conditions of 50 ℃, 1 MPa H2 pressure, and contact time of 6 gcat•h/mol. In addition, temperature-programmed reduction and X-ray photoelectron spectroscopy results showed that the precursor was calcined at 400 ℃ and reduced at 400 ℃ to form the PdZn bimetallic catalyst. The doping of Zn atoms effectively modulated the geometrical and electronic effects of the Pd active sites, which effectively inhibited the over-hydrogenation of the intermediate products. © 2021, Editorial Office of FINE CHEMICALS. All right reserved.

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