Surface cobalt silicate and CoO x cluster anchored to SBA-15: Highly efficient for cyclohexane partial oxidation

Li Li, Hui Li, Chen Jin, Xiaochen Wang, Weijie Ji*, Yi Pan, Theo Van Der Knaap, Roland Van Der Stoel, Chak Tong AU

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

The present investigation showed that the surface cobalt silicate and CoO x cluster anchored to SBA-15 are highly efficient heterogeneous catalysts for the cyclohexane partial oxidation with air-like O2 (20%)-N2 (80%) mixture as oxidant in the continuously stirred tank reactor at 413 K and 1.0 MPa. Typically, selectivity of 84.6% at cyclohexane conversion of 14.5% can be achieved in a period of 2 h reaction. The performance of Co-catalyst is affected by the nature of Co species introduced to SBA-15. The surface cobalt silicate with higher proportion of "isolated" Co2+ sites shows better result than the well dispersed CoO x clusters mainly on the internal surface of SBA-15. Furthermore, different preparation method also influences the porosity of SBA-15 and accessibility to Co sites, which may in turn affect on the reaction performance. Graphical Abstract: The surface cobalt silicate and CoOx cluster anchored to SBA-15 are highly efficient for the cyclohexane partial oxidation with air-like O2(20%)-N2(80%) mixture as oxidant in the continuously stirred tank reactor at 413 K and 1.0 MPa. Typically, selectivity of 84.6% at cyclohexane conversion of 14.5% can be achieved in a period of 2 h reaction. The catalyst performance is dependent on the nature of Co species introduced to SBA-15.

Original languageEnglish
Pages (from-to)20-27
Number of pages8
JournalCatalysis Letters
Volume136
Issue number1-2
DOIs
Publication statusPublished - May 2010

Scopus Subject Areas

  • Catalysis
  • Chemistry(all)

User-Defined Keywords

  • Cobalt
  • Cyclohexane
  • Doping
  • Oxidation
  • SBA-15

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