Citation: Xiangdong Feng, Jie Feng, Wenying Li. Insight into MgO promoter with low concentration for the carbon-deposition resistance of Ni-based catalysts in the CO₂ reforming of CH₄[J]. Chinese Journal of Catalysis, ;2018, 39(1): 88-98. doi: 10.1016/S1872-2067(17)62928-0 shu

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

Xiangdong Feng ^a,b, ,
Jie Feng ^a,b ,
Wenying Li ^a,b

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 Date: 5 July 2017
Revised Date: 17 September 2017

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

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.
- CO₂ reforming of CH₄,
- Carbon-deposition resistant,
- Activation of CO₂,
- Ni-based catalyst,
- Low concentration MgO promoter
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通讯作者: 陈斌, bchen63@163.com

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