载镍金属有序介孔氧化铝催化一氧化碳甲烷化反应性能研究

Study on catalytic activity of nickel supported on organized mesoporous alumina for methanation of carbon monoxide

采用传统浸渍法制备出两种负载镍金属有序介孔氧化铝，并采用BET法比表面积测定、X射线衍射（XRD）、程序升温还原（TPR）、X射线光电子能谱分析（XPS）、透射电镜（TEM）、电感耦合等离子体发射光谱仪（ICP—OES）等多种测试技术对合成的催化剂进行表征．通过一氧化碳甲烷化反应测定其催化活性并与负载镍金属普通氧化铝进行对比。实验结果表明，镍在两种有序介孔氧化铝上主要呈两种形态．即氧化镍和偏铝酸镍。合成的介孔氧化铝比普通氧化铝镍负载量大且分散性好，这主要归结于其具有的高比表面积（300～500mVg）及窄孔径分布（4～10nm）的稳定有序结构。催化结果表明：由于具有较高的镍负载量及较好的镍金属分散性能．因而负载镍金属有序介孔氧化铝比普通氧化铝具有较好的催化活性。

Two kinds of organized mesoporous alumina for loading nickel have been prepared by the conventional impregna- tion method.The synthesized catalysts were characterized by several techniques, such as BET,XRD ,TPR, XPS,TEM, and ICP-OES,and their activities for the methanation of carbon monoxide were tested.The comparison with the conventional nickel-loaded alumina has also been made.The characterization results indicated that the nickel species in both kinds of organized mesoporous alumina mainly presented two states：nickel oxide and nickel metaaluminate.Two mesoporous alumina exhibited much higher capacity and better dispersion of nickel than the conventional alumina.It could attribute to high surface area （300-500 m2/g） and organized stable structure with narrow pore distribution （4- 10 nm）.The catalytic results shown that nickel supported on two kinds of mesoporous alumina was much more active than on the conventional alumina for their higher loading amount and better metal dispersion performance.