摘要
The activity of two Cu/SiO2 catalysts prepared by the chemisorption hydrolysis technique has been tested in the hydrogenation reaction of 3-methyl-cyclohexanone. Both catalysts were found to be very active at 60 ℃ and 1 atm of H2. Characterization of the materials by FT-IR of adsorbed CO and TEM put in light the presence of well formed Cu cristallites. By assuming a cuboctahedral model we could show that the hydrogenation activity is linked to high coordination sites on the metal particle. A comparison is also reported with a sample prepared by ammonia evaporation that was found to be inactive in the hydrogenation reaction under the same experimental conditions.
考察了化学吸附水解法制备的两种铜/二氧化硅催化剂上3-甲基环己酮加氢反应活性.发现两种催化剂在60℃和1bar H2下催化活性非常高.吸附CO红外光谱和透电镜结果表明,催化剂中存在结晶良好的铜颗粒.通过假设一个立方八面体模型,我们可以证明加氢活性与金属颗粒上的高配位点有关.本文还与蒸氨法制备的样品进行了比较,发现在相同的实验条件下,蒸氨法样品在加氢反应中没有活性.
