In Situ Generation of H<sub>2</sub>O<sub>2</sub> over MoO<sub><i>x</i></sub> Decorated on Cu<sub>2</sub>O@CuO Core–Shell Particle Nanoarchitectonics for Boosting Photocatalytic Oxidative Desulfurization
Xinyu Zhao, Suting Xie, Dongxiao Wang, Hao Niu, Huawei Yang, Lixia Yang, Liangjiu Bai, Donglei Wei, Hou Chen
Abstract
Photocatalytic oxidation desulfurization (PODS) has emerged as a promising, ecofriendly alternative to traditional, energy-intensive fuel desulfurization methods. Nevertheless, its progress is still hindered due to the slow sulfide oxidation kinetics in the current catalytic systems. Herein, we present a MoO x decorated on a Cu 2 O@CuO core–shell catalyst, which enables a new, efficient PODS pathway by in situ generation of hydrogen peroxide (H 2 O 2 ) with saturated moist air as the oxidant source. The photocatalyst delivers remarkable specific activity in oxidizing dibenzothiophene (DBT), achieving a superior rate of 7.8 mmol g –1 h –1, while maintaining a consistent performance across consecutive reuses. Experimental investigations reveal that H 2 O 2 is produced through the two-electron oxygen reduction reaction (ORR), and both H 2 O 2 and the hydroxyl radicals ( • OH) generated from it act as the primary reactive species responsible for sulfide oxidation. Importantly, our catalyst accomplishes complete PODS of real diesel fuel, underscoring an appealing industrial prospect for our photocatalyst.