Citation:
Xiaoshan Zhang, Ning Rui, Xinyu Jia, Xue Hu, Chang-jun Liu. Effect of decomposition of catalyst precursor on Ni/CeO2 activity for CO methanation[J]. Chinese Journal of Catalysis,
;2019, 40(4): 495-503.
doi:
S1872-2067(19)63289-4
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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.
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Keywords:
- Nickel,
- CeO2,
- Carbon monoxide,
- Syngas,
- Methanation,
- Plasma
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