Production of a gasoline blending component with high-octane and low sulfur from coal tar light oil over sulfided CoMoP/η-Al_2O_3

摘要

Coal tar light oil (CTLO), an unclean byproduct of coal chemical industry, is a potential material for the manufacture of high-octane gasoline blending component. CoMo/eta-Al2O3, a catalyst with lower desulfurization performance but less octane loss, is selected from four catalysts to further reduce sulfur content of CTLO by phosphorus modification. Catalysts modified by various content of phosphorus are characterized by a series of methods. The results show that addition of appropriate amount of phosphorus can improve the structure and acidity of catalysts, and weaken the interaction between active component and carrier. Furthermore, most of naphthalene in CTLO is converted into tetralin with 1.5 wt% phosphorus loading, and tetralin can play an important role of hydrogen transfer during catalytic hydrogenation process, which promotes the removal of heteroatom compounds. When the loading of phosphorus is 1.5 wt%, the content of S-, N- heteroatom compounds is only 7.2 mg/kg, 0.021% in product oil respectively, which is beneficial to reduce automobile emissions. Meanwhile, the RON reaches 105.3, and only decreases by 2.2 units compared to the original CTLO. Product oil catalyzed by CoMoP1.5/eta-Al2O3 can be used as excellent high-octane gasoline blending component with low sulfur. (C) 2019 Elsevier Ltd. All rights reserved.