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分别采用浸渍法、沉积沉淀法和共沉淀法制备了Cu/SiO_2催化剂,利用低温N2物理吸附、XRD、H2-TPR等手段对其进行表征,并研究了该催化剂催化对羟基苯乙酸乙酯加氢的性能。结果表明,制备方法对Cu/SiO_2催化剂中Cu物种分散行为及还原性能有较大影响,进而使催化剂表现出不同的加氢活性。采用共沉淀法制备的Cu/SiO_2催化剂,活性物种Cu物种高度分散,且易于还原,表现出最佳的加氢活性,在催化剂用量为m(对羟基苯乙酸乙酯)∶m(催化剂)=25∶2.5,反应温度170℃,反应压力4MPa,反应时间15h条件下,对羟基苯乙醇收率达到99.2%。
The Cu / SiO 2 catalysts were prepared by impregnation method, deposition precipitation method and coprecipitation method respectively. The catalysts were characterized by low temperature N2 physical adsorption, XRD and H2-TPR. The effects of the catalyst on the reaction of ethylhydroxyphenylacetate Hydrogen performance. The results show that the preparation method has a great influence on the dispersion behavior and reduction performance of Cu species in the Cu / SiO 2 catalyst, which leads to different hydrogenation activity of the catalyst. Cu / SiO 2 catalyst prepared by coprecipitation method, the active species Cu species highly dispersed, and easy to restore, showing the best hydrogenation activity, the catalyst dosage of m (p-hydroxy phenyl ethyl acetate): m (catalyst) = 25: 2.5, reaction temperature 170 ℃, reaction pressure 4MPa, reaction time 15h, the yield of p-hydroxy phenethyl alcohol reached 99.2%.