Quinoline Inhibiting of Hydrodesulfurization and Hydrogenation Reactions over Co(Ni)PMo(W)/Al2O3 Catalysts: Influence of the Active Phase Composition on the Stability during Hydrotreatment of Model and Oil Feedstock

Abstract

Co(Ni)-PMo(W)/Al 2 O 3 catalysts were prepared using Keggin heteropoly acids H 3 PMo(W) 12 O 40 and cobalt (nickel) citrate. Physicochemicalproperties of the catalysts were characterized using low-temperature nitrogen adsorption, XPS and HRTEM techniques. Catalytic properties were studied during hydrotreatment of a model feedstock containing dibenzothiophene, naphthalene and quinoline in different proportions (up to 1000 ppm of nitrogen), as well as during hydrotreatment of straight-run diesel fraction and vacuum gasoil. The composition of Со(Ni)-PMo(W)/Al 2 O 3 catalysts was shown to play a crucial role in the hydrotreatment of complex hydrocarbon feedstock. The Ni-PW/Al 2 O 3 catalyst was more stable to organonitrogen inhibitors than Ni(Co)-PMo/Al 2 O 3 bearing more reactive active centers. The highest conversions of sulfur- and nitrogen-containing compounds and polycyclic aromatic hydrocarbons during hydrotreatment of vacuum gasoil were observed with the Ni-PW/Al 2 O 3 catalyst.