PMoV 2 was encapsulated in four MOFs (MIL-101, HKUST-1, UiO-67, ZIF-8) with different cavity sizes and window sizes using a hydrothermal synthesis method. Then, a layer of mesoporous silica was coated on the surface of the MOFs to obtain four designed three-layer encapsulated catalysts 30%PMoV 2 @MOF@mSiO 2 . The physicochemical properties of the catalysts were characterized through various characterization methods, and the influence of different MOF window sizes of the four catalysts on the removal rate of four thiophene sulfides was investigated. The optimal reaction conditions were also explored for the optimal catalyst. The results indicate that under simulated fuel of 2400 ppm, 30%PMoV 2 @UiO-67@mSiO 2 owns the highest catalytic activity. Under optimal conditions, the total removal rate of four thiophene compounds was 91.52 %, and after ten cycles, the efficiency could still reach 86.24 %. This is attributed to the sufficient cavity size of UiO-67, which provides assurance for the loading of PMoV 2 and the large window size, making it possible for the smooth reaction between sulfides and PMoV 2 .
In this article, composite materials PMoV 2 @UiO-66-X (X = H, NH 2 , NO 2 , SO 3 H) are prepared by using hydrothermal synthesis method, and then the surfaces of the composite materials are coated with mSiO 2 shell to obtain three-layer coated catalysts PMoV 2 @UiO-66-X@mSiO 2 . The prepared catalysts were characterized by FT-IR, XRD, N 2 adsorption desorption isotherms, SEM, and TEM. The catalytic oxidation desulfurization performance of the catalyst was studied using GC–MS, and the optimal reaction conditions of the catalysts were explored, including temperature, stirring rate, catalyst dosage, and oxidant dosage. The results indicate that at 800 ppm of simulated fuel, PMoV 2 @UiO-66-NO 2 @mSiO 2 has the highest catalytic activity, with a total desulfurization efficiency of 98 % under optimal conditions. After eight cycles, the efficiency can still reach 94 %, which is attributed to the strong acidity provided by PMoV 2 , the electron donating effect of the –NO 2 group, and the stable core–shell structure after coating with mSiO 2 .The paper further confirmed the high catalytic activity of the catalyst through UV–Vis analysis.
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