In situ formed Co clusters in selective oxidation of α-C–H bond

Stabilizing effect from reactants

Zhijie Wang, Anxiang Guan, Mayfair C. Kung, Anyang Peng, Harold H Kung, Ximeng Lv, Gengfeng Zheng, Linping Qian

Research output: Contribution to journalArticle

Abstract

Aerobic oxidation of α-C–H bond of organic compounds to valuable chemicals is widely investigated in both fundamental research and industry. Due to the good stability of molecular oxygen, severe reaction conditions are generally required. Herein, by in situ synthesis we used molecular oxygen to induce cobalt nanoclusters with the sensitive catalysis in mild selective oxidation. The cobalt containing clusters with an average diameter around 0.9 nm are in situ prepared in the presence of cis-cyclooctene epoxidation and cyclooctene dimer oxide is formed at the interface to stabilize Co clusters with electron donation as an oil-soluble surfactant. The soluble clusters exhibit high activity in selective oxidation of α-C–H bond of ethylbenzene into acetophenone and turnover number (TON) reaches about 7 × 10 4 during 50 h’ reaction at 373 K, which is around 960 times more active than the one using CoCl 2 salt as the catalyst, resulting from efficient mass transportation, π bond interaction and oxygen gas activation. Extended work based on this understanding demonstrates that cobalt nanoclusters also effectively catalyze aerobic oxidation of cyclohexene.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalMolecular Catalysis
Volume470
DOIs
Publication statusPublished - Jun 1 2019

Fingerprint

Cobalt
methylidyne
Oxidation
oxidation
cobalt
Molecular oxygen
Nanoclusters
nanoclusters
oxygen
Mass transportation
epoxidation
Epoxidation
Ethylbenzene
organic compounds
Organic compounds
Surface-Active Agents
Dimers
Oxides
Catalysis
catalysis

Keywords

  • Aerobic oxidation
  • cis-Cyclooctene
  • Co nanoclusters
  • Cyclohexene
  • Ethylbenzene

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

Cite this

In situ formed Co clusters in selective oxidation of α-C–H bond : Stabilizing effect from reactants. / Wang, Zhijie; Guan, Anxiang; Kung, Mayfair C.; Peng, Anyang; Kung, Harold H; Lv, Ximeng; Zheng, Gengfeng; Qian, Linping.

In: Molecular Catalysis, Vol. 470, 01.06.2019, p. 1-7.

Research output: Contribution to journalArticle

Wang, Zhijie ; Guan, Anxiang ; Kung, Mayfair C. ; Peng, Anyang ; Kung, Harold H ; Lv, Ximeng ; Zheng, Gengfeng ; Qian, Linping. / In situ formed Co clusters in selective oxidation of α-C–H bond : Stabilizing effect from reactants. In: Molecular Catalysis. 2019 ; Vol. 470. pp. 1-7.
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