Preparation of Anderson-type CoMo6-2NH2@ECOF for highly active catalysis on aerobic oxidative desulfurization of fuel under O2

Abstract

Deep desulfurization with high-efficiency is imperia for environmental demands with increasing stringent standard of sulfur content in fuels. To develop high efficiency heterogeneous catalyst for aerobic oxidative desulfurization (AODS) of fuel, an Anderson-type CoMo6-2NH2 (POM) as active site, which was considered to be very effective in catalyzing the activation of O2, was successfully anchored on the sub-stoichiometric ECOF as a carrier by Schiff-base condensation reaction between –NH2 groups in CoMo6-2NH2 and –CHO groups in ECOF. The anchoring of CoMo6-2NH2 on ECOF by covalent bond resulted in the heterogenization of CoMo6-2NH2 enabled CoMo6-2NH2@ECOF to be recyclable during the AODS process. When CoMo6-2NH2@ECOF was applied as catalyst for AODS of fuel with surfactant (OTAC) under O2, it exhibited excellent catalytic activity with almost 100 % removal rates under 95 °C for 6 h. Moreover, the catalyst can be recycled 7 times without significant loss of catalytic activity. Further, the structure-activity relationship was investigated and the reaction mechanism of AODS of fuel was verified by ESR, XPS analysis and selective quenching experiments.