CO<sub>2</sub> Methanation Performance of Cerium Zirconium Solid Solution Supported Nickel Catalyst

Abstract The Ce_xZr_1-xO₂ solid solution was prepared by coprecipitation, and a series of Ni/Ce_xZr_1-xO₂ catalysts were prepared by using citric acid method. X-ray diffraction (XRD), N₂ adsorption-desorption (N₂-BET), temperature programmed desorption (TPD), temperature programmed reduction (TPR) and other techniques were used to characterize the catalysts. The effect of Ce/Zr ratio and nickel content on the catalytic performance of CO₂ methanation for catalysts was tested in a micro fixed bed reactor. The results showed that 12% Ni/Ce_0.25Zr_0.75O₂ catalyst had the best catalytic performance under the conditions of atmospheric pressure, 200℃ and airspeed of 15 000 mL·g^-1·h^-1, getting as high as 74% CO₂ conversion and nearly 100% CH₄ selectivity. The stability test results of Ni/Ce_0.25Zr_0.75O₂ catalyst for 300 h show that it has high anti-sintering performance. The excellent activity of the catalyst was attributed to the adoption of a new loading method:citric acid loaded active component nickel, which achieved high dispersion of nickel and large specific surface area of the catalyst.

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	Xu Hongtu
	Ma Zongyan
	Wang Jiaming
	Wang Hong
	Liu Yuan

Keywords： CO₂ methanation； cerium zirconium solid solution； Ni

Received 2020-04-10;

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Xu Hongtu, Ma Zongyan, Wang Jiaming, Wang Hong, Liu Yuan.CO₂ Methanation Performance of Cerium Zirconium Solid Solution Supported Nickel Catalyst[J] Chemcial Industry and Engineering, 2020,V37(6): 18-29

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