Work

Tungsten phosphide nanoparticles anchored on ultrathin carbon nanosheets for efficient oxidative desulfurization: Pivotal roles and generation pathways of singlet oxygen

Year: 2024

Type: article

Abstract: Singlet oxygen ( 1 O 2 ) is an excellent reactive oxygen species for the selective oxidation of organic compounds. Therefore, its application in oxidative desulfurization (ODS) of fuels is theoretically promising, while this has rarely been systematically investigated. Herein, a novel ultrathin carbon nanosheet (CN)-supported tungsten phosphide (WP) catalyst (WP/CN) was devised and employed to activate hydrogen peroxide (H 2 O 2 ) for the efficient 1 O 2 generation in ODS. The turnover frequency of WP/CN for the oxidation of dibenzothiophene was as high as 32.7 h −1 at 60 °C, surpassing that of most reported ODS catalysts. More importantly, benefiting from the high selectivity of 1 O 2 , the WP/CN-H 2 O 2 system exhibited exceptional interference resistance and achieved complete ODS of real diesels at a molar ratio of H 2 O 2 to S of 4:1 (the theoretical value is 2:1), outperforming reported ODS systems. The results of experiments and density functional theory calculations demonstrated that the most reasonable reaction pathway for the formation of 1 O 2 was H 2 O 2 →H 2 O 2 *→2OH*→O*→2O*→ 1 O 2 *. The present findings may provide new insights into the development of high-performance and energy-saving ODS processes.

Source: Journal of Hazardous Materials

DOI: 10.1016/j.jhazmat.2024.136623

Authors: Juncong Zou, Chengche Wu, Shaohua Wu, Shanying He, Xiang Li, Chunping Yang

Institutions: Hunan University, Guangdong University of Petrochemical Technology, Zhejiang Gongshang University, Hainan University

Language: English

Topic: Catalysis and Hydrodesulfurization Studies

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $4,340