Selective methanation of CO in the presence of CO₂ in hydrogen-containing mixtures on nickel catalysts

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• 作者：M. M. Zyryanova ; P. V. Snytnikov ; Yu. I. Amosov ; S. A. Ven¡¯yaminov ; E. Z. Golosman and V. A. Sobyanin
• 刊名：Kinetics and Catalysis
• 出版年：2010
• 出版时间：December 2010
• 年：2010
• 卷：51
• 期：6
• 页码：907-913
• 全文大小：204.5 KB

文摘

The screening of commercial nickel catalysts for methanation and a series of nickel catalysts supported on CeO₂, γ-Al₂O₃, and ZrO₂ in the reaction of selective CO methanation in the presence of CO₂ in hydrogen-containing mixtures (1.5 vol % CO, 20 vol % CO₂, 10 vol % H₂O, and the balance H₂) was performed at the flow rate WHSV = 26000 cm3 (g Cat)−1 h−1. It was found that commercial catalytic systems like NKM-2A and NKM-4A (NIAP-07-02) were insufficiently effective for the selective removal of CO to a level of <100 ppm. The most promising catalyst is 2 wt % Ni/CeO₂. This catalyst decreased the concentration of CO from 1.5 vol % to 100 ppm in the presence of 20 vol % CO₂ in the temperature range of 280–360¡ãC at a selectivity of >40 % , and it retained its activity even after contact with air. The minimum outlet CO concentration of 10 ppm at 80 % selectivity on a 2 wt % Ni/CeO₂ catalyst was reached at a temperature of 300¡ãC.