Effect of the Composition and Morphology of the Active Phase of NiMoW/P-Al2O3 Catalysts with Different Mo/W Ratios on Their Activity in the Reactions of Dibenzothiophene Hydrogenolysis and Naphthalene Hydrogenation

Resumo

A series of catalysts have been synthesized Ni–Mo–W/P-Al₂O₃ with different Mo: W ratios (a sample without W, Mo: W = 2: 1, Mo: W = 1: 1, Mo: W = 1: 2, and a sample without Мо) and a concentration of P₂O₅ in a support of 0.5 wt %. Heteropoly acids H₃PMo₁₂O₄₀ · nH₂O and H₃PW₁₂O₄₀ · nH₂O and nickel citrate were precursors of the active phase. High-resolution transmission electron microscopy and X-ray photoelectron spectroscopy were used to study the surface of the sulfide phase of the samples. Their catalytic activity was estimated in the reactions of dibenzothiophene hydrodesulfurization and naphthalene hydrogenation. A catalyst with the ratio Mo: W = 1: 1 showed the highest activity, and was characterized by the maximum concentration of atomic groups Ni–Mo–W–S, Mo–S, and W–S.