Comparative Study of New Re-Ni-Mo/Al2o3 and Conventional Hydrodesulphurization Catalyst

Abstract

New types of hydrodesulfurization (HDS) catalyst Re-Ni-Mo/ γ-Al₂O₃ was prepared and tested separately with two prepared conventional HDS catalysts (Ni-Mo/ γ-Al₂O₃ and Co-Mo//γ-Al₂O₃) by using a pilot plant hydrotreatment unit. Activities of three prepared hydrodesulfurization catalysts were examined in hydrodesulfurization (HDS) of atmospheric gas oil at different temperatures 275 to 350 °C and LHSV 1 to 4 h^-1, the reactions conducted under constant pressure 40 bar and H₂/HC ratio 500 ml/ml .Moreover, the hydrogenation of aromatic (HAD) in gas oil has been studied. HDS was much improved by adding promoter Re to the Ni-Mo/Al₂O₃ catalyst. The results showed that Re-Ni-Mo/ γ-Al₂O₃ have more activity in desulfurization than Ni-Mo//γ-Al₂O₃ and Co-Mo/ γ-Al₂O₃ catalysts. The efficiency of hydrodesulfurization was markedly reduced over the Co -Mo/ γ-Al₂O₃.Also the result showed that Ni-Mo//γ-Al₂O₃ have a minimum aromatic content 15.44 %.