摘要
改变前驱体溶液中Fe^(2+)与Fe^(3+)物质的量比制备了系列Au/α-Fe_2O_3水煤气变换催化剂,并运用XRD、拉曼光谱和H_2-TPR对样品进行表征。结果表明,Fe^(2+)与Fe^(3+)物质的量比的变化对Au/α-Fe_2O_3催化剂低温水煤气变换活性具有显著影响,这是由Fe^(2+)的添加改变了载体α-Fe_2O_3的结晶度、结晶缺陷及晶粒大小,从而影响金纳米颗粒的分散及与载体间的相互作用。Fe^(2+)与Fe^(3+)适宜物质的量比为1:6,所得样品AF-1:6具有最佳低温活性,150℃,CO转化率达78.02%。
A series of Au/a-Fe2O3 catalysts for water-gas shift reaction were prepared in precursor solu- tion with different Fe2＋/Fe3 ＋ molar ratios and characterized by XRD, Raman spectrum and H2-TPR. The results showed that the catalytic activity of Au/a-Fe2O3 catalysts for the low-temperature water-gas shift reaction were remarkably influenced by Fe2＋/Fe3＋ molar ratios in the precursor solution. The introduction of Fe2＋ ion induced the changes in crystallinity, concentration of defects and crystal size of catalyst support a-Fe2O3, thereby the dispersion of the nano-gold particles and the interaction between nano-gold particles and a-Fe203 were also influenced. The optimum molar ratio of Fe2＋/Fe3＋ was 1 ： 6 and the corresponding sample AF-1： 6 exhibited superior catalytic activity for low-temperature water-gas shift reaction, with CO conversion of 78.02% at 150℃.
出处
《工业催化》
CAS
2011年第4期37-40,共4页
Industrial Catalysis
基金
国家自然科学基金(20771025)
福州大学博士后启动基金(826641)
