Oxidative Desulfurization of DBT with H₂O₂ over 3DOM H₃PW₁₂O₄₀/Al₂O₃ Catalyst

Abstract

A series of heteropoly acid (HPA) based Al₂O₃ catalysts with three-dimensional ordered (3DOM) structure were synthesized by colloidal crystal template method. Interconnected macropores (250 nm) could be clearly observed by scanning electron microscope (SEM) and transmission electron microscope (TEM). Mesopores could be detected by N₂ adsorption-desorption isotherms which further confirmed the 3DOM structural characteristics of catalyst. Moreover, Keggin-type HPW was highly dispersed in the Al₂O₃ framework, which suggested by powder X-ray diffraction (XRD) and Fourier transform infrared spectra (FT-IR) results. The oxidation desulfurization (ODS) performance of 3DOM H₃PW₁₂O₄₀/Al₂O₃ of refractory sulphur compounds was evaluated in the presence of hydrogen peroxide. It oxidized 98.5% of dibenzothiophene (DBT) into corresponding sulfone within 3 h, which exhibited superior ODS performance than corresponding mesoporous and microporous H₃PW₁₂O₄₀/Al₂O₃ catalyst. The enhancement of ODS efficiency is related to the improvement of mass transfer of DBT in the pore channel resulting from the interconnected 3DOM structure. Furthermore, the as-prepared catalyst still demonstrates outstanding cycle performance after 6 runs, which could be easily recovered from the model fuel.

Keywords

3DOM structure / oxidative desulfurization / H₃PW₁₂O₄₀/Al₂O₃ catalyst

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