1. Ultra-deep oxidative desulfurization of high sulfur liquid fuels with molybdenum carbide@carbon loaded on N-doped graphene.
- Author
-
Liu, Yefeng, Zuo, Peng, Wang, Ruixin, and Jiao, Weizhou
- Subjects
- *
DESULFURIZATION , *LIQUID fuels , *GRAPHENE , *ELECTRON paramagnetic resonance , *MOLYBDENUM , *PETROLEUM as fuel , *GRAPHENE oxide - Abstract
[Display omitted] • Mo 2 C nanoparticles was well-dispersed on N-doped graphene via in-situ carbonization of the PMo 12 -PEI/GO precursor. • Mo 2 C@NC/NrGO presented the maximum kinetic constant of 0.35 min−1 for ODS of liquid fuel with 4000 ppm of the initial S content. • The radical scavenging experiments revealed a ODS mechanism of HO• radicals. A new composite Mo 2 C@NC/NrGO, with very small and well-distributed molybdenum carbide (Mo 2 C) nanoparticles on N-doped graphene, was prepared via carbonization of the tricomponent composite PMo 12 -PEI/GO comprising phosphomolybdic acid (H 3 PMo 12 O 40 ·xH 2 O), polyethyleneimine (PEI), and graphene oxide (GO). The as-prepared Mo 2 C@NC/NrGO exhibited outstanding oxidative desulfurization (ODS) performance and achieved the ultra-deep desulfurization of liquid fuel under mild conditions, which was attributed to the synergistic effect of extraction and catalytic oxidation. In particular, catalytic oxidation played a dominant role, which originated from the excellent characteristics of Mo 2 C@NC/NrGO, such as the small size and even distribution of Mo 2 C on graphene, as well as the improved activation of oxidant by the electronic transfer of N-doped graphene to Mo 2 C. For oxidative desulfurization (ODS) of 4000 ppm of DBT, Mo 2 C@NC/NrGO showed the high kinetic constant (>0.35 min−1), which can make 4000 ppm of DBT removed completely within 10 min. A HO• radical mechanism for oxidative desulfurization (ODS) of fuel oils was revealed on the basis of radical experiments and electron paramagnetic resonance (EPR). Moreover, the prepared catalyst presented a good recyclability for six runs with no significant loss of activities. Overall, Mo 2 C@NC/NrGO could be suggested as a prospective catalyst for ODS. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF