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A set of hydro treating experiments are carried out on vacuum gas oil in a trickle bed reactor to study the
hydrodesulfurization and hydrodenitrogenation based on two model compounds, carbazole (non-basic
nitrogen compound) and acridine (basic nitrogen compound), which are added at 0–200 ppm to the tested
oil, and dibenzotiophene is used as a sulfur model compound at 3,000 ppm over commercial CoMo/
Al2O3 and prepared PtMo/Al2O3. The impregnation method is used to prepare (0.5% Pt) PtMo/Al2O3.
The basic sites are found to be very small, and the two catalysts exhibit good metal support interaction. In
the absence of nitrogen compounds over the tested catalysts in the trickle bed reactor at temperatures of
523 to 573 K, liquid hourly space v
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