Study On NiW/γ-Al₂O₃Catalysts For Hydroprocessing Of Low-Temperature Coal Tar

Low-temperature coal tar can be converted clean and efficiently by hydroprocessing to obtain high-performance aviation jet fuel components rich in cycloalkanes and hydroaromatics. NiW catalysts were prepared with different metal loading, with gamma-alumina hydrothermal treated at different temperatures and with different zeolite Y addition, and characterized with N2adsorption, H2-TPR, XRD, SEM and NH3-TPD. The effect of Ni/W atomic ratio, pore structure and support acidity on the texture, metal dispersion and reducibility of the catalysts were investigated. Hydrotreating of naphthalene-cresol were carried out to test the catalysts activities and the reaction pathways and catalytic mechanism were proposed. Hydroprocessing of coal tar fraction with selected catalysts were performed to examine the production of cycloalkanes and hydroaromatics from phenols and aromatics. The results showed that the content of cycloalkanes and hydroaromatics increased significantly with the prepared catalysts, especially the one with5%zeolite Y.