【摘要】 用化学还原法制备Ni-B/SiO2非晶态催化剂,用XRD、SEM等对其非晶态特征进行表征,并用于苯乙酮的催化加氢实验,讨论了加氢反应条件对苯乙酮的转化率及选择性的影响.结果表明,Ni-B/SiO2非晶态催化剂具有很高的催化活性,在80℃、氢气压力3.0MPa、反应时间5h条件下,苯乙酮的转化率为100%,其中α-苯乙醇选择性为92.1%,乙苯为4.9%,其余(环己基甲基酮和α-环己基乙醇)为3.0%;在120℃、氢气压力3.0MPa、反应时间5h的条件下,苯乙酮的转化率为100%,其中乙苯选择性为90.2%,其余(α-苯乙醇、环己基甲基酮和α-环己基乙醇)为9.8%.因此,温度改变对产物分布有极大的影响.更多还原

【Abstract】 The supported Ni-B/SiO₂ amorphous catalyst prepared by chemical reduction exhibited high catalytic activity in hydrogenation of acetophenone. The structure of catalyst was characterized by XRD and SEM. The effect of reaction conditions on conversion and selectivity was also studied. Under the reaction conditions of T=80 ℃, P=3.0 MPa, t=5 h, the conversion of acetophenone reached 100% with selectivity of 92.1% 1-phenylethanol, 4.9% ethylbenzene, and 3.0% other byproducts, respectively. But at higher temperature of 120 ℃, the conversion of acetophenone reached 100% with 90.2% selectivity of ethylbenzene and the 9.8% was others. The results showed that the distribution of products in the hydrogenation was closely related to reaction temperature.更多还原