Ceria supported nickel catalysts for CO removal from H₂-rich gas

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• 作者：Zhiming GAO (高志明)^a ; ^{zgao@bit.edu.cn} ; Qianzi DAI (代倩子)^a ; Hongwei MA (马宏伟)^a ; Zhanping LI (李展平)^b
• 关键词：CO selective methanation ; nickel ; ceria ; chlorine doping ; adsorption ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：34
• 期：12
• 页码：1213-1220
• 全文大小：1749 K
• 卷排序：34

文摘

CO in H2-rich gas must be removed to meet various requirements in industrial applications. Four methods, i.e., the precipitation method using aqueous ammonia, the complexing method using urea, the complexing method using citric acid and the precipitation method using ammonium carbonate, were adopted to prepare samples NiO/CeO2 as catalyst precursors for removal of CO from H2-rich gas via selective methanation reaction. The sample NiO/CeO2 prepared by the precipitation method using aqueous ammonia as precipitant exhibited the highest catalytic activity both for CO methanation and for CO2 methanation after reduction prior to the catalytic reaction. Chlorine ion was then doped to suppress CO2 conversion. Effect of chlorine doping was investigated. Over the optimal catalyst 40%Ni(Cl0.2)/CeO2, CO in the H2-rich gas was removed to below 10 ppm with selectivity of 60% or higher at reaction temperatures 230–250 °C in the test period of 75 h.