炭包覆氧化铝负载镍催化剂的制备和表征及其催化加氢性能

以炭包覆A12O3(CCA)为载体,采用等体积浸渍法制备了17%Ni/CCA催化剂,采用热重-差示量热扫描、扫描电镜、X射线光电子能谱、N2物理吸附、H2程序升温还原和X射线衍射等手段对样品进行了表征,并用于粗1,4-丁二醇加氢反应中.结果表明,炭的引入显著改变了Al2O3的表面性质、负载Ni的存在形态以及金属.载体间...

Preparation and Characterization of Carbon-Covered Alumina Supported Ni Catalyst and Its Catalytic Performance for Hydrogenation

Carbon-covered alumina (CCA) was prepared by pyrolysis of sucrose dispersed on a γ-Al₂O₃ support, and 17% Ni/CCA catalyst was prepared by impregnation with CCA. Effect of carbon addition on the catalytic performance of Ni/Al₂O₃ was investigated for the hydrogenation of crude 1,4-butanediol aqueous solution. The catalyst samples were characterized by thermogravimetry-differential scanning calorimetry, scanning electron microscopy, X-ray photoelectron spectroscopy, N₂ adsorption, H₂ temperature-programmed reduction, and X-ray diffraction. The results indicated that the addition of carbon resulted in the changes in the surface properties of the support, the nickel dispersion, and metal-support interaction of the catalyst, leading to different hydrogenation activity of the catalyst. When the carbon loading was 11.6%, the catalyst sample showed the highest nickel dispersion, the mild metal-support interaction and the highest activity for the hydrogenation of crude 1,4-butanediol solution.