Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (3): 20210754.doi: 10.7503/cjcu20210754

• Physical Chemistry • Previous Articles     Next Articles

Preparation of Supported Pd-Cu Catalyst and Its Preferential Oxidation of CO Under Hydrogen-rich Atmosphere

ZHAO Wanjun1,2, LI Xiao1,2, Dang Hui1,2, WANG Yongzhao1(), ZHAO Yongxiang1()   

  1. 1.Engineering Research Center of Ministry of Education for Fine Chemicals
    2.School of Chemistry and Chemical Engineering,Shanxi University,Taiyuan 030006,China
  • Received:2021-11-01 Online:2022-03-10 Published:2021-12-28
  • Contact: WANG Yongzhao,ZHAO Yongxiang E-mail:catalyst@sxu.edu.cn;yxzhao@sxu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(U170221);the Natural Science Foundation of Shanxi Province, China(201801D121043)

Abstract:

Three supported Pd-Cu catalysts(PC-Al2O3, PC-SiO2, PC-C3N4) were prepared by a simple impregnation method using Al2O3, SiO2, and C3N4 as supports. And their catalytic performance toward CO preferential oxidation at room temperature were investigated. XRD, FTIR, N2-physisorption, H2-TPR, CO2-TPD, XPS and in situ DRIFTS were used for analysis and characterization. The results show that compared with PC-SiO2 and PC-C3N4, PC-Al2O3 shows better CO preferential oxidation performance, which is due to the formation of a large number of Cu2Cl(OH)3 species with strong interaction with Pd species on PC-Al2O3. However, PC-SiO2 exists only a small amount of Cu2Cl(OH)3 and its weaker interaction with Pd species. In addition, Cu species in PC-C3N4 is more likely to coordinate with C3N4 matrix, which weakens the interaction between Pd and Cu. Above all, Pd+ species with stronger CO activation ability readily emerge on the surface of PC-Al2O3 in the reaction atmosphere, which possess the close interaction with a large number of Cu+ species. And this can inhibit the complete reduction of Pd+ to Pd0 to a certain extent, so as to maintain its catalytic activity. Hence, compared with SiO2 and C3N4, Al2O3 is more suitable for supporting Pd-Cu for CO preferential oxidation in hydrogen.

Key words: Wacker catalyst, Pd-Cu catalyst, CO preferential oxidation(CO-PROX), Carrier effect

CLC Number: 

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