Abstract
Pure ZrO2, TiO2, and ZiO2-TiO2 mixed oxides are prepared by urea hydrolysis. Hydrotreating catalysts containing 8 wt% (MoO3) and 3 wt% (NiO) are prepared using these oxides and characterized by the Brunauer, Emmett, and Teller (BET) surface area, pore volume, X-ray diffraction, Fourier transform infrared, differential thermal analysis, and scanning electron microscopy. Thiophene hydrodesulfurization, cyclohexene hydrogenation, and cumene hydrocracking are taken as model reactions for evaluating catalytic activities in a micro-catalytic reactor at 350°C and atmospheric pressure. Sulfided catalysts showed a wide range of activity variation as a function of support composition, which established that NiMo sulfided active phases strongly depend on the nature and composition of the support. It is found that catalytic activities increase with increasing zirconia content in mixed oxide and reach maximum values for 20% zirconia content. (20%) Zr/Ti mixed oxide supported catalyst was tested at high pressure with real gas oil feedstock. A thorough study of the relationship between operating conditions and product quality would contribute much to the optimization of hydrotreatment processes.
Published Version
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