SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2018, Vol. 26 ›› Issue (11): 2344-2350.DOI: 10.1016/j.cjche.2018.05.025

• Special issue of Carbon Capture, Utilisation and Storage • Previous Articles     Next Articles

Carbon deposition and catalytic deactivation during CO2 reforming of CH4 over Co/MgO catalyst

Jianwei Li1,2, Jun Li1, Qingshan Zhu1,3   

  1. 1 State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    2 State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;
    3 School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-02-02 Revised:2018-05-18 Online:2018-12-10 Published:2018-11-28
  • Contact: Jun Li, Qingshan Zhu
  • Supported by:

    Supported by the National Natural Science Foundation of China (21736010, U1462128, 91334108) and the State Key Development Program for Basic Research of China (2015CB251402).

Carbon deposition and catalytic deactivation during CO2 reforming of CH4 over Co/MgO catalyst

Jianwei Li1,2, Jun Li1, Qingshan Zhu1,3   

  1. 1 State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    2 State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;
    3 School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • 通讯作者: Jun Li, Qingshan Zhu
  • 基金资助:

    Supported by the National Natural Science Foundation of China (21736010, U1462128, 91334108) and the State Key Development Program for Basic Research of China (2015CB251402).

Abstract: The deactivation mechanism of Co/MgO catalyst for the reforming of methane with carbon dioxide was investigated. The conversion of CH4 displayed a significant decrease in the initial stage caused by carbon deposition. There were two types of cokes, carbon nanotubes (CNTs) and carbon nano-onions (CNOs). The number of the CNO layers that coated on the surface of Co nanoparticles (NPs) increased rapidly in the initial reforming time, which was responsible for the deactivation of the Co/MgO catalyst. The deposition of CNOs was attributed to the oxidation of Co NPs. Therefore, the deactivation of the Co/MgO catalyst was originated from the first oxidization of the Co NPs into Co3O4 by O species (OH intermediate, CO2, H2O) during the reforming reaction, which accelerates the formation of coke that blocked the active metal, thus led to catalyst deactivation.

Key words: Co/MgO, CH4 reforming, Carbon deposition, Co oxidization

摘要: The deactivation mechanism of Co/MgO catalyst for the reforming of methane with carbon dioxide was investigated. The conversion of CH4 displayed a significant decrease in the initial stage caused by carbon deposition. There were two types of cokes, carbon nanotubes (CNTs) and carbon nano-onions (CNOs). The number of the CNO layers that coated on the surface of Co nanoparticles (NPs) increased rapidly in the initial reforming time, which was responsible for the deactivation of the Co/MgO catalyst. The deposition of CNOs was attributed to the oxidation of Co NPs. Therefore, the deactivation of the Co/MgO catalyst was originated from the first oxidization of the Co NPs into Co3O4 by O species (OH intermediate, CO2, H2O) during the reforming reaction, which accelerates the formation of coke that blocked the active metal, thus led to catalyst deactivation.

关键词: Co/MgO, CH4 reforming, Carbon deposition, Co oxidization