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 us...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（Cl（0.2））/CeO2, CO in the H2-rich gas was removed to below 10 ppm with selectivity of 60% or higher at reaction temperatures 230–250 ℃ in the test period of 75 h.展开更多
基金Project supported partially by the National Natural Science Foundation of China(21171020)
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（Cl（0.2））/CeO2, CO in the H2-rich gas was removed to below 10 ppm with selectivity of 60% or higher at reaction temperatures 230–250 ℃ in the test period of 75 h.
