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