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 E-mail:czwang@sxu.edu.cn
  • 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)

Abstract:

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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