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Stable and Surface‐active Co Nanoparticles Formed from Cation ( x ) Promoted Au/ x ‐Co 3 O 4 ( x =Cs) as Selective Catalyst for [2+2+1] Cyclization Reactions
Author(s) -
Oseghale Charles O.,
Mogudi Batsile M.,
Onisuru Oluwatayo Racheal,
Akinnawo Christianah Aarinola,
Fapojuwo Dele Peter,
Meijboom Reinout
Publication year - 2021
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.202001841
Subject(s) - catalysis , cobalt , chemistry , mesoporous material , inorganic chemistry , nanoparticle , cobalt oxide , heterogeneous catalysis , alkali metal , carbonylation , materials science , organic chemistry , nanotechnology , carbon monoxide
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 H 2 into atomic species on the catalyst surface by spillover, which in‐situ reduces the robust mesoporous cobalt oxide to metallic cobalt (Co 3+ →Co 2+ →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 H 2 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.