焙烧温度对Au/Fe2O3选择性氧化富氢气体中CO催化性能的影响

甲醇重整在线制氢作为质子交换膜燃料电池的燃料成为当前研究的热点。受重整反应动力学及热力学的限制，使得甲醇重整气(富氢气体)中除含有大量的氢气外还含有少量的CO，CO极易吸附在燃料电池阳极催化剂表面，使电池性能下降，因而必须去除重整气中的CO，选择性氧化脱除富氢气

Effect of calcination temperature on CO selective oxidation in H2-rich gas over Au/Fe2O3 catalyst

The 1.5% Au/Fe2O3 catalysts prepared by an inverse co-precipitation method calcined at different temperatures was characterized by XRD, XPS, TEM, BET, and tested by CO selective oxidation in H2-rich gas. The results show that the chemical composition and activity of the catalysts are greatly changed with the variation of calcination temperature. The catalyst Au/Fe2O3 calcined at 20 ℃, highly dispersed particles with the partially oxidized gold species on the support with the mean diameter of 3 nm～5 nm, displayes the best activity and selectivity of CO selective oxidation. However, the catalytic activity of Au/Fe2O3 decreases drastically with increasing calcination temperature due to the aggregation of metallic gold and bigger particle sizes. It is found that the catalytic behavior is related to the gold particle size but the nature of the support. On the basis of characterization data, in addition to the particle size of metallic gold, the oxidation states of gold are proven to be important for CO selective oxidation in H2-rich gas.