Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (1): 88-98.DOI: 10.1016/S1872-2067(17)62928-0

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Insight into MgO promoter with low concentration for the carbon-deposition resistance of Ni-based catalysts in the CO2 reforming of CH4

Xiangdong Fenga,b, Jie Fenga,b, Wenying Lia,b   

  1. a Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China;
    b Training Base of State Key Laboratory of Coal Science and Technology Jointly Constructed by Shanxi Province and Ministry of Science and Technology, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
  • Received:2017-07-05 Revised:2017-09-17 Online:2018-01-18 Published:2018-01-19
  • Contact: 10.1016/S1872-2067(17)62928-0
  • Supported by:

    This work was supported by the National Natural Science Fundation of China (U1361202, 51276120).

Abstract:

The CO2 reforming of CH4 is studied over MgO-promoted Ni catalysts, which were supported on alumina prepared from hydrotalcite. This presents an improved stability compared with non-promoted catalysts. The introduction of the MgO promoter was achieved through the "memory effect" of the Ni-Al hydrotalcite structure, and ICP-MS confirmed that only 0.42 wt.% of Mg2+ ions were added into the Ni-Mg/Al catalyst. Although no differences in the Ni particle size and basicity strength were observed, the Ni-Mg/Al catalyst showed a higher catalytic stability than the Ni/Al catalyst. A series of surface reaction experiments were used and showed that the addition of a MgO promoter with low concentration can promote CO2 dissociation to form active surface oxygen arising from the formation of the Ni-MgO interface sites. Therefore, the carbon-resistance promotion by nature was suggested to contribute to an oxidative environment around Ni particles, which would increase the conversion of carbon residues from CH4 cracking to yield CO on the Ni metal surface.

Key words: CO2 reforming of CH4, Carbon-deposition resistant, Activation of CO2, Ni-based catalyst, Low concentration MgO promoter