Hydrofining of Coal Tar Light Oil to Produce High Octane Gasoline Blending Components over 纬-Al2O3- and 畏-Al2O3-Supported Catalysts

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• 作者：Ruijun Sun ; Shuguang Shen ; Dongfeng Zhang ; Yunpeng Ren ; Jimin Fan
• 刊名：Energy & Fuels
• 出版年：2015
• 出版时间：November 19, 2015
• 年：2015
• 卷：29
• 期：11
• 页码：7005-7013
• 全文大小：518K
• ISSN：1520-5029

文摘

The effectiveness and suitability for hydroconversion of coal tar light oil (CTLO), a byproduct from the coal chemical industry, were studied over 纬-Al₂O₃- and 畏-Al₂O₃-supported Ni鈥揗o and Co鈥揗o catalysts in a continuous fixed-bed reactor. This work focused on eliminating sulfur-, nitrogen-, and oxygen-containing heterocycles with a smaller loss of octane number and producing high octane gasoline blending components (HOGB) with high value. Ni鈥揗o catalysts showed better hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) activity than that of Co鈥揗o catalysts. In addition to active metal components, the overall performance of the catalyst was also closely associated with the type of support. Higher density of medium strength acid sites, better dispersion of active components, and weaker metal鈥搒upport interaction jointly contributed to the higher activity of 畏-Al₂O₃-supported catalysts. Compared with 纬-Al₂O₃, 畏-Al₂O₃-supported catalysts possessed more octahedrally coordinated Mo species, thus more highly active type II Co(Ni)-Mo-S phase was formed. It was encouraging to see that the sulfur content (8.3 ppm) and bromine value (0.24 g Br/100 g) of the product were meeting the Euro V Standard over NiMo/畏-Al₂O₃ under the experimental conditions. Moreover, the octane number of the product reached up to 100.7 in spite of a larger octane number loss during the hydroprocessing of CTLO.