Citation: Feng Yan, Caixian Zhao, Lanhua Yi, Jingcai Zhang, Binghui Ge, Tao Zhang, Weizhen Li. Effect of the degree of dispersion of Pt over MgAl₂O₄ on the catalytic hydrogenation of benzaldehyde[J]. Chinese Journal of Catalysis, ;2017, 38(9): 1613-1620. doi: 10.1016/S1872-2067(17)62815-8 shu

Effect of the degree of dispersion of Pt over MgAl₂O₄ on the catalytic hydrogenation of benzaldehyde

Feng Yan ^a,b, ,
Caixian Zhao ^a ,
Lanhua Yi ^a ,
Jingcai Zhang ^b ,
Binghui Ge ^c ,
Tao Zhang ^b ,
Weizhen Li ^b

a Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, School of Chemistry, Xiangtan University, Xiangtan 411105, Hunan, China;
b State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
c Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Received Date: 14 February 2017
Revised Date: 15 March 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (21403213, 21673226, 21376236, U1462121), the "Hundred Talents Programme" of the Chinese Academy of Sciences, and National Key R&D Program of China (2016YFA0202801), and the "Strategic Priority Research Program" of the Chinese Academy of Sciences (XDB17020100), Department of Science and Technology of Liaoning province under contract of 2015020086-101, and the Natural Science Foundation of Hunan Province (2016JJ2128).

One of the central tasks in the field of heterogeneous catalysis is to establish structure-function relationships for these catalysts, especially for precious metals dispersed on the sub-nanometer scale. Here, we report the preparation of MgAl₂O₄-supported Pt nanoparticles, amorphous aggre-gates and single atoms, and evaluate their ability to catalyze the hydrogenation of benzaldehyde. The Pt species were characterized by N₂ adsorption, X-ray diffraction (XRD), aberration-corrected transmission electron microscopy (ACTEM), CO chemisorption and in situ Fourier transform infra-red spectroscopy of the chemisorbed CO, as well as by inductively coupled plasma atomic emission spectroscopy. They existed as isolated or neighboring single atoms on the MgAl₂O₄ support, and formed amorphous Pt aggregates and then nanocrystallites with increased Pt loading. On the MgAl₂O₄ support, single Pt atoms were highly active in the selective catalytic hydrogenation of ben-zaldehyde to benzyl alcohol. The terrace atoms of the Pt particles were more active but less selec-tive; this was presumably due to their ability to form bridged carbonyl adsorbates. The MgAl₂O₄-supported single-atom Pt catalyst is a novel catalyst with a high precious atom efficiency and excellent catalytic hydrogenation ability and selectivity.
- Platinum,
- MgAl₂O₄ spinel,
- Single-atom catalyst,
- Selective hydrogenation,
- Benzaldehyde,
- Benzyl alcohol
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Effect of the degree of dispersion of Pt over MgAl₂O₄ on the catalytic hydrogenation of benzaldehyde