多环芳烃双效耦合加氢催化剂制备及其加氢性能

Preparation of double effect coupling catalysts and their performance in hydrogenation of polycyclic aromatic hydrocarbons

多环芳烃加氢饱和既有利于环境保护,还能促进煤焦油的高效率利用。以煤焦油中(210~360)℃富含2-4环多环芳烃馏分为研究对象,采用加氢饱和催化剂与分子筛催化剂作为双效耦合催化剂,对不同反应条件下煤焦油催化加氢反应性能进行研究。结果表明,双效耦合催化剂具备分子筛催化剂与加氢饱和催化剂的催化特性,同时具备两者相互作用较小的稳态结构,且其在多环芳烃催化加氢反应中的活性介于分子筛催化剂和加氢饱和催化剂之间;活性金属组分Ni和Mo在催化剂表面分布稳定均匀。各操作条件对多环芳烃加氢性能存在不同程度的影响,双效耦合催化剂耦合比为4∶6时,多环芳烃催化加氢性能优于其他耦合比催化剂,在反应温度380℃、氢初压8.0 MPa、反应时间60 min和剂油比5∶100条件下,具有较好的加氢性能。馏分油多次选择性加氢后,饱和分量明显增加,胶质和芳香分量明显减少。

The hydrogenation saturation of polycyclic aromatic hydrocarbons is conducive to environmental protection and promotes the high-quality utilization of coal tar.In this paper,the coal tar fraction rich in 2-4 ring polycyclic aromatic hydrocarbons at(210-360)℃was taken as the research object,and the hydrogenation saturated and zeolite catalysts were used as the double effect composite catalyst.The results indicate that the double effect coupling catalyst has the respective reaction characteristics and stable structure with less interaction between zeolite and hydrogenation saturated catalyst,which has catalytic hydrogenation activity between zeolite and hydrogenation saturated catalyst in polycyclic aromatic hydrocarbons.The active metal components Ni and Mo show stable and uniform distribution in the catalyst.The catalytic hydrogenation performance of difunctional coupling catalyst with the coupling ratio of 4∶6 for polycyclic aromatic hydrocarbons is better than other coupling ratio catalysts.Under the process conditions of reaction temperature 380℃,initial hydrogen pressure of 8.0 MPa,reaction time of 60 min,and the catalyst oil ratio of 5∶100,the hydrogenation performance of the catalyst is better.After multiple selective hydrogenation of distillate oil,the content of saturates significantly increases,while the content of resin and aromatics significantly decreases.