Co/Cu/γ-Al_2O_3催化剂制备及其性能

Preparation of Co/Cu/γ-Al_2O_3 catalysts and its properties

以钴盐为主催化剂,以铜盐为助催化剂,采用等体积浸渍法,以γ-Al_2O_3为载体,制备了Co/Cu/γ/-Al_2O_3催化剂,以对甲酚为原料对催化活性进行测试,并采用XRD、FT—IR、XPS和BET表征方法对催化剂的晶体结构、表面电子状态和比表面积进行表征,研究各种因素对催化活性的影响。结果表明,Co_3O_4为催化剂的活性组分,催化剂中活性组分未与载体发生强烈的相互作用,且其比表面积最大,有利于活性组分的分散。Co/Cu/γ-Al_2O_3催化剂最佳制备条件为:Co与Cu物质的量比为5:1,浸渍液质量浓度为6%,焙烧温度400℃,对羟基苯甲醛收率为41.5%。

Co/Cu/γ-Al2O3 catalyst was prepared by impregnation method with cobalt acetate and copper acetate. The catalytic activity was tested using p-cresol as the raw material. The crystal structure, surface electronic state and specific surface area of Co/Cu/γ-Al2O3 catalyst were characterized by XRD, FT-IR, XPS and BET. The influence of the factors on catalytic activity were investigated. The results showed that Co3O4 was the active component of the catalyst,and there was no strong interaction between active components and the carrier, and the catalyst possessed the largest surface areas which were beneficial to the dispersion of active components, p-Hydroxybenzaldehyde yield of 42% was attained over Co/Cu/γ-Al2O3 catalyst prepared under the optimal condition as follows：Co/Cu molar ratio 5： 1, the concentration of the impregnation solution 6% , and calcination temperature 400 ℃ .