Abstract
This study investigates the effect on catalytic activity of inserting tungsten metal (W) into trimetallic W-Mo-Co supported on a Gamma-Alumina (γ-Al2O3) heterogeneous catalyst used for hydrodesulphurisation (HDS) in an oil refinery. Bimetallic Co5Mo15/γ-Al2O3 and a trimetallic Co5Mo14W1/γ-Al2O3 catalysts were synthesised using incipient wetness impregnation. The synthesised trimetallic Co5Mo14W1/γ-Al2O3 catalyst exhibited better catalytic performance, with an 88% hydro-removal percentage of sulphur based on an HDS reaction of petroleum naphtha as compared to the 82% for the bimetallic 5Co-15Mo/γ -Al2O3 catalyst under the same operational conditions at a pressure of 11.5 bar, a temperature 598 K, and a reaction time of 3 hr. This enhanced catalyst activity can be attributed to the presence of tungsten increasing the number of metal sites on the catalyst’s reaction surface.
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