Efficient Hydrodesulfurization Catalyst Prepared With a Novel Anderson Ni‐W POM

ABSTRACT

A novel Anderson Ni‐W polyoxometalate Ni ₂ [NiW ₆ O ₂₄ H ₆ ] was prepared by cation substitution to obtain an optimal Ni/W ratio (0.5), and the novel polyoxometalate was employed as a single precursor to prepare an efficient hydrodesulfurization catalyst, replacing the conventional precursors of the ammonium metatungstate and nickel nitrate, and the as‐prepared catalyst was evaluated with dibenzothiophene as the model compound. The novel Anderson Ni‐W polyoxometalate was confirmed, and the as‐prepared catalyst was characterized by several technologies. The results showed that the turnover frequency and the reaction rate constant of the as‐prepared catalyst are 2.2×10 ⁻³ s ⁻¹ and 3.9×10 ⁻⁷ mol·g ⁻¹ ·s ⁻¹ , which are 1.16 times and 2.17 times those of the reference catalyst, respectively. The higher hydrodesulfurization activity is derived from the higher dispersion of WS ₂ slabs and more NiWS active phases, which result from the optimal Ni/W ratio and the atomic‐scale proximity of Ni and W atoms in a single precursor. This cation substitution strategy overcomes the phase segregation and non‐optimal metal ratio drawbacks of traditional impregnation precursors simultaneously.