过渡金属修饰对铜铈催化剂在选择性脱除CO反应中催化性能的影响

Influence of transition metals doping on the catalytic performance of CuO-CeO_2 catalysts for the preferential oxidation of CO in excess hydrogen.

过渡金属(Mn、Fe、Ni、Zn、Co)修饰对铜铈催化剂的催化性能有明显的影响.Fe和Co的修饰对铜铈催化剂的CO氧化活性有较明显的促进作用,在110℃时,CO的转化率即达到99%;尤其Co的修饰增加了铜铈催化剂上CO转化率为99%的温度‘窗口’宽度约30℃,而Mn、Ni和Zn的修饰对铜铈催化剂的CO氧化活性则有一定的抑制作用.但不同过渡金属修饰对铜铈催化剂的氧化选择性均有明显的提高.

Doping of different transition metals （Mn, Fe, Ni, Zn, Co） has an evident influence on the catalytic performance of CuO-CeO2 catalysts for the preferential oxidation of CO in excess hydrogen. As for Fe and Co, the doping enhances the catalytic activity of CuO-CeO2 catalysts for preferential oxidation of CO in excess hydrogen. For example, the CO conversion over the above catalysts was as high as 99% at 110 ℃. Especially, the doping of Co widens the temperature window of CO conversion of 99% over CuO-CeO2 catalysts by 30 ℃. For Mn, Ni and Zn, the doping depresses the catalytic activity of CuO-CeO2 catalysts for the preferential oxidation of CO in excess hydrogen. However, the doping of transition metals markedly improves the selectivity of CuO-CeO2 catalysts in preferential oxidation of CO in excess hydrogen.