The Role of tungsten in trimetallic Co-Mo-W/γ-Al₂O₃ heterogeneous catalysts for efficient hydro-desulphurisation

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.

Catalytic Deoxygenation of Oleic Acid Over CoMo/Zeolite Catalyst for Green Diesel Production

“…The introduction of CoMo onto the supports was carried out with the incipient wetness impregnation method, using cobalt nitrate hexahydrate (Co (NO3)2•6H2O) as the precursor (Mahdi & Albdiry, 2021). To prepare a solution consisting of 0,14 g of cobalt and 0.5 g of Molybdenum from ammonium heptamolybdate tetrahydrate ((NH4)6Mo7O24.4H2O) salt, mix with 100 ml of distilled water and keep them at room temperature for about 6 hours.…”