摘要
分别采用四方晶型的t-Zr O2和单斜晶型的m-Zr O2作为载体,用溶液浸渍负载方法制备了Ru/Zr O2催化剂,并对催化剂的物理化学性质进行了BET、XRD等表征。研究结果表明,采用老化回流处理后的t-Zr O2相比于m-Zr O2具有更高的比表面积和孔容,从而提高了金属Ru的分散性与催化活性,并有利于环己烯的传质扩散,使Ru/t-Zr O2具有更高的苯加氢合成环己烯收率,此外Ru/t-Zr O2催化剂有较好的再生性,其使用6次后依然能够保持较高的催化活性。Ru的负载量的增加能够提高苯选择性加氢的收率,当Ru/t-Zr O2型催化剂中Ru的负载质量分数为8%时,苯选择性加氢收率最高,可达29%。氢气压力为4.2 MPa,反应温度为423 K,Ru/Zr O2催化剂的用量为质量分数1.2%为优化的反应条件,在此条件下有最佳的收率以及较高的经济效益。
Ru/Zr O2 catalyst was prepared with solution impregnation load method respectively using two different type substrates which were tetragonal t-Zr O2 and monoclinic m-Zr O2. Then BET and XRD were carried out for characterization of physical and chemical properties of the catalysts. It was found that t-Zr O2 had larger specific surface area and pore volumethan m-Zr O2, so as to improve the dispersion and catalytic activity of Ru as well as mass diffusion of cyclohexene, thus the reaction over Ru/t-Zr O2 showed higher catalysis activity and higher selectivity of cyclohexene. Ru/Zr O2 also exhibited good regenerative ability, maintaining high catalytic activity after 6 times recycling. Besides, more loading capacity of Ru may lead to higher conversion, when the loading capacity was 8%, the conversion reached the highest 29%. The optimum reaction conditions were also explored. Under the conditions of 4.2 MPa hydrogen pressure, 423 K reaction temperature, 1.2%(mass fraction) of Ru on Zr O2, the reaction had the highest conversion and profits.
出处
《化工生产与技术》
CAS
2015年第4期29-31,56,共4页
Chemical Production and Technology
关键词
环己烯
加氢
氧化锆
苯
钌
cyclohexene
hydrogenation
zirconia
benzene
ruthenium
