A 31P-NMR study of peroxo species formed during oxidation of cyclohexene with hydrogen peroxide in tri-n-butylphosphate catalyzed by heteropolyacids

Masato Hashimoto, Koshi Itoh, Kwan Young Lee, Makoto Misono

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

In the oxidation of cyclohexene with H2O2 in monophasic tri-n-butylphosphate (TBP) solution catalyzed by Keggin-type 12-heteropolyacids, i.e., H3PMo12-xWxO40 (x = 0-12), several peroxo species were observed by 31P-NMR spectroscopy in lower field than the original heteropolyacids. Their composition varied regularly with that of the starting catalyst. The P-containing peroxo species formed was deduced as [PM4O8(O2)8]3- (M = Mo, W). The peroxo species formed more easily with a decrease in the W content, x of H3PMo12-xWxO40). It was further indicated from the reactivity with cyclohexene and the comparison with catalytic performance that W-rich peroxo species were catalytically more active than Mo-rich peroxo species for the oxidation of cyclohexene in this reaction system.

Original languageEnglish
Pages (from-to)265-271
Number of pages7
JournalTopics in Catalysis
Volume15
Issue number2-4
DOIs
Publication statusPublished - 2001

Keywords

  • Heteropoly catalyst
  • Olefin oxidation
  • P-NMR
  • Peroxopolyoxometalates

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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