Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (8): 20220074.doi: 10.7503/cjcu20220074

• Physical Chemistry • Previous Articles     Next Articles

Atomic Scale Investigation of Pt Atoms/clusters Promoted Co-catalyzed Fischer-Tropsch Synthesis

WEI Chunhong1,2, JIANG Qian2, WANG Panpan2,3, JIANG Chengfa1(), LIU Yuefeng2()   

  1. 1.College of Chemical Engineering,Sichuan University,Chengdu 610065,China
    2.Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China
    3.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2022-02-04 Online:2022-08-10 Published:2022-05-08
  • Contact: JIANG Chengfa,LIU Yuefeng E-mail:jiangcf@scu.edu.cn;yuefeng.liu@dicp.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(22172161);the Liaoning Revitalization Talents Program, China(XLYC1907053);the Chinese Academy of Science Youth Innovation Promotion Association(2018220);the China Postdoctoral Science Foundation(2018M641726)

Abstract:

By utilizing scanning transmission electron microscopy with spherical aberration(AC-STEM), combining with H2-TPR, CO-chemisorption and quasi in situ XAS, we investigated the promotion effect of the noble metal, platinum in cobalt-based Fischer-Tropsch catalysts, and the effect of metal-support interaction was excluded by the use of the chemical inert support, β-SiC. It was concluded that the Pt promoter improved both the dispersion and reduction of cobalt nanoparticles, which increase the amount of Co0 active sites, and therefore facilitate the catalytic performance of Fischer-Tropsch synthesis. With the aid of AC-STEM, it was observed that Pt was in atomic dispersion in the form of single atoms and clusters. According to this structure, we speculated that the promotion effect of Pt followed the H2 dissociation and spillover mechanism. The Pt dispersed on cobalt nanoparticles stimulated the H2 dissociation on the catalyst to a great extent. On one hand, this favored the reduction of cobalt species, on the other hand, it facilitated the H2 activation and hydrogen-associated CO dissociation during Fischer-Tropsch synthesis, and thus enhanced the activity of the catalyst and improved the selectivity of saturated hydrocarbons.

Key words: Cobalt-based catalyst, Fischer-Tropsch synthesis, Pt promoter, Atomic dispersion, Hydrogen spillover

CLC Number: 

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