Preparation and Oxidative Desulfurization Properties of Hpmo@ Hierarchical Porous Uio-66-Nh2

Polyoxometaliates (POMs), as a highly efficient catalyst, are limited by difficult recycle due to their excellent solubility. MOFs are emerging as new catalytic materials with large specific surface area in recent years, while they are generally limited by the small pore size. In this paper, UIO-66-NH2 was first modified under cetane trimethyl ammonium bromide (CTAB) to expand its pore size and obtain hierarchical porous support, and then phosphomolybdic acid (HPMo) was loaded into hierarchical porous UIO-66-NH2 to form composite catalyst by a simple impregnation method. The formed 40Mo@0.15C sample has good ODS performance in the acetonitrile-simulated oil two-phase system because of the co-catalytic action between HPMo and the unsaturated Zr metal active site. After reaction at 60℃ for 12min, the removal rate of dibenzothiophene (DBT) can reach 100%, which is higher than that of most HPMo-supported composite catalysts. The 40Mo@0.15C has good cycle stability, the ODS performance can still reach 96.45% after 10 cycles, and the structure and composition of the catalyst do not change after the cycle. Due to the electrostatic attraction between amino (-NH2) and HPMo, HPMo leakage can be effectively prevented and the Mo loss rate was only 0.86% after 10 cycles. This strategy provides a new idea for preparing composite catalysts with hierarchical porous structure, and the prepared composite catalysts have potential application value in industry.