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

doi:10.1016/j.cjche.2018.05.025

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 Li^1,2, Jun Li¹, Qingshan Zhu^1,3

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 Li^1,2, Jun Li¹, Qingshan Zhu^1,3

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

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

Jianwei Li, Jun Li, Qingshan Zhu. Carbon deposition and catalytic deactivation during CO₂ reforming of CH₄ over Co/MgO catalyst[J]. Chin.J.Chem.Eng., 2018, 26(11): 2344-2350.

Jianwei Li, Jun Li, Qingshan Zhu. Carbon deposition and catalytic deactivation during CO₂ reforming of CH₄ over Co/MgO catalyst[J]. Chinese Journal of Chemical Engineering, 2018, 26(11): 2344-2350.

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

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

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