Chemical Journal of Chinese Universities ›› 2020, Vol. 41 ›› Issue (11): 2488-2495.doi: 10.7503/cjcu20200385

• Physical Chemistry • Previous Articles     Next Articles

Effect of Steric Confinement Dimension on Metal Site Anti-carbon Deposition Ability of Ni-SiO2 Catalysts in CH4-CO2 Reforming

WU Hao, WANG Changzhen(), QIU Yuan, TIAN Yani, ZHAO Yongxiang   

  1. Engineering Research Center of Ministry of Education for Fine Chemicals,School of Chemistry and Chemical Engineering,Shanxi University,Taiyuan 030006,China
  • Received:2020-06-23 Online:2020-11-10 Published:2020-11-06
  • Contact: WANG Changzhen
  • Supported by:
    Supported by the National Natural Science Foundation of China(21603127);the Scientific andTechnological Innovation Programs of Higher Education Institutions in Shanxi Province, China(2020L0018)


The sintering and carbon deposition of active sites are the main obstacles for the industrial application of methane reforming over Ni-based catalysts. As for the various improvement approaches, the use of steric geometry limiting structure can effectively limit the sintering and carbon deposition of Ni particles. However, there is still a lack of systematic understanding of their relationships based on the confinement dimension. In this paper, three Ni-SiO2 catalysts(i.e., traditional supported Ni/SiO2, mesoporous Ni/SBA-15 and core-shell Ni@SiO2) with the same chemical composition but different metal exposure structures were prepared to investigate the influence of different steric limiting dimensions/structures on the metals’ anti-carbon deposition mechanism in CH4-CO2 reforming. The results showed that Ni/SiO2 has little steric limiting effect, thus showing the weakest carbon resistance ability and the worst stability. The Ni/SBA-15 has partial steric limiting effect and its anti-carbon deposition ability is significantly improved, while Ni@SiO2, which has a complete geometric limiting effect, shows the strongest carbon resistance ability with the optimal stability.

Key words: Ni-based catalyst, Methane reforming, Steric confinement, Confinement dimension, Anticarbon deposition

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