Triazine-based covalent organic polymer as a high aerobic oxidative desulfurization performance catalyst under mild reaction conditions

Aerobic oxidative desulfurization (AODS) has attracted significant attention due to the utilization of environ-mentally friendly and safe O2 as an oxidizing agent. However, it is still a great challenge to design metal-free catalysts that activate O2 effectively at low temperature. In this study, a triazine-based covalent organic poly-mer (MC-TCOP) was prepared through thermal condensation reaction, and the basic characteristics of the catalyst were analyzed by different characterization methods. The MC-TCOP was applied into the AODS reaction, and the catalytic performance reached to 99.6% under mild reaction conditions (T = 50 & DEG;C, t = 150 min, gas flow = 90 mL/min, catalyst dosage = 0.04 g). Theoretical calculation showed O2 and dibenzothiophene (DBT) were co-adsorbed on the active sites of the catalyst, and the reaction mechanism indicated the O2 was activated into & BULL;O2  (by the charge difference between the nitrogen and carbon atoms), then the DBT was oxidized to corresponding sulphone. Moreover, reusability experiment confirmed the catalyst performance was still higher than 95% after 9 times of reusing. The MC-TCOP can be used as a metal-free and eco-friendly catalyst in AODS reaction.