Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (6): 1070-1080.DOI: 10.1016/S1872-2067(18)63035-9

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Hydrogenation of 2-ethylanthraquinone with bimetallic monolithic catalysts: An experimental and DFT study

Yanyan Guo, Chengna Dai, Zhigang Lei   

  1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2017-12-27 Revised:2018-01-24 Online:2018-06-18 Published:2018-05-16
  • Contact: 10.1016/S1872-2067(18)63035-9
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21476009, 21406007, U1462104).

Abstract:

We studied the hydrogenation of 2-ethylanthraquinone (eAQ) over Pd/SiO2/COR (COR=cordierite) monometallic and Pd-M/SiO2/COR (M=Ni, Fe, Mn, and Cu) bimetallic monolithic catalysts, which were prepared by the co-impregnation method. Detailed investigations showed that the particle sizes and structures of the Pd-M (M=Ni, Fe, Mn, and Cu) bimetallic monolithic catalysts were greatly affected by the second metal M and the mass ratio of Pd to the second metal M. By virtue of the small particle size and the strong interaction between Pd and Ni of Pd-Ni alloy, Pd-Ni bimetallic monolithic catalysts with the mass ratio of Pd/Ni=2 achieved the highest H2O2 yield (7.5 g/L) and selectivity (95.3%). Moreover, density functional theory calculations were performed for eAQ adsorption to gain a better mechanistic understanding of the molecule-surface interactions between eAQ and the Pd(1 1 1) or PdM(1 1 1) (M=Ni, Fe, Mn, and Cu) surfaces. It was found that the high activity of the bimetallic Pd-Ni catalyst was a result of strong chemisorption between Pd3Ni1 (1 1 1) and the carbonyl group of eAQ.

Key words: Bimetallic monolithic catalyst, Alloy, 2-Ethylanthraquinone hydrogenation, DFT calculation, Synergistic effect