Ni-Mg/Al_2O_3催化剂上催化裂化轻汽油的选择性加氢

Selective Hydrogenation of FCC Light Gasoline on Ni-Mg/Al_2O_3 Catalyst

制备了以γ-Al2O3为载体的镍基双金属选择性加氢催化剂,并用于催化裂化轻汽油的选择性加氢反应。考察了载体焙烧温度、金属镍与镁的负载量对催化剂选择性加氢性能的影响。结果表明,适当高的焙烧温度降低了催化剂的比表面积和表面酸性,提高了催化剂的稳定性。助剂镁的加入有利于活性组分Ni的均匀分散,并进一步降低催化剂的表面酸性。在反应温度80℃、空速10h-1、氢油体积比为10、压力1 5MPa的条件下,采用NI:(10%)-Mg(1 5%)/AL2O3催化剂,催化裂化轻汽油中二烯烃转化率达到98%以上。制备的选择性加氢催化剂具有良好的活性和选择性,可望在选择性加氢领域获得应用。

In this research work, the bimetal selective Ni-based hydrogenation catalysts supported on γ-Al_2O_3 were prepared. They were used to the selective hydrogenation of the FCC gasoline. The effect of the calcinatory temperature, the contents of nickel and magnesium on the performances of selective hydrogenation catalysts was investigated. The results showed that the properly high temperature could reduce the specific surface area and surface activity, at the same time increased the stability of the catalysts. Furthermore, magnesium served as a promoter was advantageous to the evenly dispersion of nickel and reduction of the surface acidity of the catalysts. Under the following reaction conditions: temperature is 80℃, LHSV is 10, VH/VO is 10, pressure is 1.5MPa, catalyst is Ni(10%)-Mg(1.5%)/Al_2O_3, the diene in the FCC gasoline reduced more than 98%. It was evidenced that this kind selective hydrogenation catalyst had better activity and selectivity and could apply in the field of selective hydrogenation.