Enhancing the oxidative desulfurization efficiency of cobalt-loaded-porous carbon catalyst via nitrogen doping on carbon support

Biswa Nath Bhadra, Sung Hwa Jhung

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19 Scopus citations

Abstract

Melamine (M)-incorporated bimetallic (Zn/Co)-azolate framework-6s (M(x)@BM6s) (with wide M-contents) composites were firstly synthesized via an in-situ method and used as a precursor to derive Co/N-enriched porous carbon (M(x)@BMC6s) via pyrolysis. Very small Co-nanoparticles (4–10 nm) uniformly distributed on highly porous carbon with much N-doping were obtained from M(x)@BM6s. The developed Co-based materials with high N-content were used as catalysts for heterogeneous oxidative desulfurization (ODS) of liquid model fuel, critical for the environment and the petroleum industry. M(x)@BMC6s (with various N-contents), especially the M(10)@BMC6 (obtained from M(10)@BM6 with 10% M), were more competitive in ODS than orther tested Co-based catalysts (without or with less N-sites) and comparable to the reported catalysts to date. For example, the turnover frequency of M(10)@BMC6 was 61.1 h˗1 and ∼10 times that of Co/activated carbon. Additionally, the good reactivity of M(10)@BMC6 with adequate reusability might be understood by the good dispersion of small Co-nanoparticles. Importantly, dominant role of the doped N-species on carbon, by enhancing the synergy between Co- and N-species, was firstly suggested in this study. Finally, incorporation of N-sites in the carbon support for Co-nanoparticles can enhance the ODS performance, thus being suggested as an effective way to develop oxidation catalysts with outstanding performance.

Original languageEnglish
Article number132168
JournalJournal of Cleaner Production
Volume360
DOIs
StatePublished - 1 Aug 2022

Keywords

  • Co-nanoparticles
  • Metal-organic framework
  • N-enriched carbon
  • Oxidative desulfurization
  • Pyrolysis

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