复合载体及其制备方法对非晶态Ni-B合金催化剂性能的影响  

Effects of the Composite Support and Its Preparation Methods on Properties of Ni-B Amorphous Alloy Catalyst

作　　者：石秋杰[1] 雷经新[1] 李小玉[1] 

机构地区：[1]南昌大学应用化学所,江西南昌330047

出　　处：《分子催化》2007年第5期433-437,共5页Journal of Molecular Catalysis(China)

基　　金：江西省自然科学基金资助项目(0320012)

摘　　要：采用浸渍法及溶胶-凝胶法制备了TiO2-Al2O3复合载体,采用浸渍还原法制备了负载型非晶态Ni-B合金,以糠醛液相加氢制糠醇为探针反应考察了不同载体及复合载体的不同制备方法对非晶态Ni-B合金催化性能的影响.采用等离子发射光谱(ICP)、差示扫描量热法(DSC)、透射电镜(TEM)、H2化学吸附法、程序升温还原(TPR)和程序升温脱附(TPD)等技术研究了负载型非晶态Ni-B合金的负载量、合金组成、热稳定性、粒子大小和形态、活性表面积、还原性能以及吸附性能等.用N2吸附法测定了催化剂及载体的比表面和孔径.研究结果表明,与单一氧化铝载体相比,复合载体负载的Ni-B合金催化活性和选择性明显提高,浸渍法制备的TiO2-Al2O3复合载体负载Ni-B合金的催化性能优于溶胶-凝胶法.主要的原因为复合载体负载的催化剂中Ni含量更高,Ni-B粒子细化导致活性表面积更大,以及催化剂的还原及吸附性能发生改变.Effects of different supports and preparation methods for composite support on the catalytic properties of the amorphous Ni B alloy were studied, and the liquid phase hydrogenation of furfural to furfural alcohol was selected as probe reaction. The results show that Ni B amorphous alloy catalysts supported on composite support TiO2- Al2O3 exhibit higher activity and selectivity than Ni-B/γ-Al2O3. The former catalysts show more Ni content, larger active surface area and stronger Ni-B- support interaction than the later, resulting in the higher activity. Decrease of micropore number, which is favor in the diffusion of the product, and easier desorption from the surface of the catalysts, leads to the higher selectivity. The activity and selectivity of Ni-B/TiO2-Al2O3 （I）are higher than those of NiB/TiO2-Al2O3 （S）.

关 键 词：复合载体 制备方法 NI-B非晶态合金 糠醛加氢制糠醇 催化性能 

分 类 号：O643.32[理学—物理化学]