Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (4): 495-503.DOI: 10.1016/S1872-2067(19)63289-4

• Article • Previous Articles     Next Articles

Effect of decomposition of catalyst precursor on Ni/CeO2 activity for CO methanation

Xiaoshan Zhang, Ning Rui, Xinyu Jia, Xue Hu, Chang-jun Liu   

  1. Collaborative Innovation Center of Chemical Science and Engineering(Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
  • Received:2018-10-20 Revised:2018-12-25 Online:2019-04-18 Published:2019-03-14
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21476157, 21536008 and 21621004), and the National Key R&D Program of China (2016YFB0600902).

Abstract:

CO methanation on Ni/CeO2 has recently received increasing attention. However, the low-temperature activity and carbon resistance of Ni/CeO2 still need to be improved. In this study, plasma decomposition of nickel nitrate was performed at ca. 150℃ and atmospheric pressure. This was followed by hydrogen reduction at 500℃ in the absence of plasma, and a highly dispersed Ni/CeO2 catalyst was obtained with improved CO adsorption and enhanced metal-support interaction. The plasma-decomposed catalyst showed significantly improved low-temperature activity with high methane selectivity (up to 100%) and enhanced carbon resistance for CO methanation. For example, at 250℃, the plasma-decomposed catalyst showed a CO conversion of 96.8% with high methane selectivity (almost 100%), whereas the CO conversion was only 14.7% for a thermally decomposed catalyst.

Key words: Nickel, CeO2, Carbon monoxide, Syngas, Methanation, Plasma