Stable and Surface-active Co Nanoparticles Formed from Cation (x) Promoted Au/x-Co3O4 (x=Cs) as Selective Catalyst for [2+2+1] Cyclization Reactions

Charles O. Oseghale, Batsile M. Mogudi, Oluwatayo Racheal Onisuru, Christianah Aarinola Akinnawo, Dele Peter Fapojuwo, Reinout Meijboom

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Surface-active and highly stable cobalt nanoparticles generated from alkali ion-promoted gold catalyst for catalyzed carbonylative [2+2+1] cyclization reaction, is described. The gold nanoparticle‘s (AuNPs) role was assumed to dissociate the CO and H2 into atomic species on the catalyst surface by spillover, which in-situ reduces the robust mesoporous cobalt oxide to metallic cobalt (Co3+→Co2+→Co), as the active catalytic species that catalyzed the reaction; thereby providing up to 93 % yield of cyclopentenone adducts. Prior to this, catalyst pre-treatment with H2 gas (130 °C, 3 h, 20 atm) was performed to reduce the catalyst. It appeared that the low reducibility temperature and increased surface basicity ascribed to the presence of alkali ion-promoters in the catalyst revealed a strong correlation with the catalyst activity, for the intra- and intermolecular reactions under milder reaction conditions. Thus, a sustainable, highly reusable, and environmentally friendly green catalyst for the carbonylation reaction, such as Pauson-Khand, was developed.

Original languageEnglish
Pages (from-to)1311-1316
Number of pages6
JournalChemCatChem
Volume13
Issue number5
DOIs
Publication statusPublished - 5 Mar 2021

Keywords

  • Alkali ion-promoters
  • Cobalt nanoparticles
  • Gold catalyst
  • Mesoporous cobalt
  • Pauson-Khand

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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