Metal-free aerobic oxidative desulfurization over a diethyltriamine-functionalized aromatic porous polymer

초록

A new cross-linked aromatic porous polymer (CAPP) from bifonazole and 4,4'-bis(bromomethyl)biphenyl was prepared and functionalized with diethyltriamine (DETA). The product CAPP-DETA was applied as a catalyst for the removal of thiophenic sulfur compounds via oxidative desulfurization: 100% conversion of dibenzothiophene (DBT) was achieved with 50 mg of CAPP-DETA for 400 ppm DBT in decane at 120 degrees C after 4 h using O-2 as the oxidant. The reaction was carried out under different reaction conditions of temperature (80 to 140 degrees C), catalyst amount (10 to 50 mg), and concentration (200 to 1000 ppm). Radical scavenger experiments indicated the reaction involving the triamine functionality in the catalyst generating the superoxide (O-2(center dot-)) radicals. The conversion efficiency among the thiophenic compounds followed a sequence of dibenzothiophene > benzothiophene > thiophene. The catalyst was reusable for four repetitive cycles without deterioration in catalytic activity.

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