Effect of Quinoline on Hydrodesulfurization and Hydrogenation on Bi- and Trimetallic NiMo(W)/Al2O3 Hydrotreating Catalysts

Abstract

The effect of quinoline on the hydrodesulfurization and hydrogenation activities of bi- and trimetallic NiMo(W)/Al₂O₃ hydrotreating catalysts obtained using Keggin heteropoly acids H₄SiMo₃W₉O₄₀, H₄SiMo₁₂O₄₀, and H₄SiW₁₂O₄₀ (denoted as SiMo₃W₉, SiMo₁₂, and SiW₁₂, respectively) and a mixture of two monometallic heteropoly acids (SiMo₁₂ and SiW₁₂) was studied. The catalytic properties were determined in a fixed-bed microreactor in hydrotreating of model feedstock containing dibenzothiophene and naphthalene and of the same feedstock with the addition of quinoline. The trimetallic NiMoW/Al₂O₃ sample based on the mixed SiMo₃W₉ heteropoly acid exhibited 1.5 times higher catalytic activity in all the reactions studied compared to its analog prepared from a mixture of SiMo₁₂ and SiW₁₂ heteropoly acids with the same metal ratio. The trimetallic NiMoW/Al₂O₃ catalyst based on the mixed SiMo₃W₉ heteropoly acid surpassed in the activity the NiMo/Al₂O₃ sample and was more resistant to the inhibiting effect of quinoline than its analog prepared from a mixture of the two heteropoly acids. The correlations of the inhibiting effect of quinoline with the morphology of the active phase particles and the content of promoted active sites Ni(Mo)WS in the bi- and trimetallic NiMo(W)/Al₂O₃ catalysts were found.