A cascade aerobic epoxidation of alkenes over Au/CeO2 and Ti-mesoporous material by "in situ" formed peroxides

Carmela Aprile, Avelino Corma, Marcelo E. Domine, Hermenegildo Garcia, Chris Mitchell

Research output: Contribution to journalArticle

Abstract

The one-pot epoxidation of alkenes with O2 is performed with nano-particulated Au/CeO2 and Ti-MCM-41 silylated materials in the presence of a hydrocarbon and azobis-iso-butyronitrile (AIBN) as a promoter. This initiator is able to form organo-gold species that promote the formation of hydrocarbon (3-methyl-pentane, ethylbenzene, or cumene) hydroperoxides which in the presence of Ti-mesoporous material epoxidize the alkene in good yields. The epoxidation reaction of 1-octene with molecular oxygen (PO2 = 12 bars) at 90 °C over AIBN-Au/CeO2 + Ti-MCM-41-silylated catalytic system results in alkene conversions close to 9% (≈40% of the maximum conversion attainable) with epoxide selectivity around 90% when working with cumene as a sacrificial hydrocarbon.

Original languageEnglish
Pages (from-to)44-53
Number of pages10
JournalJournal of Catalysis
Volume264
Issue number1
DOIs
Publication statusPublished - 15 May 2009

Keywords

  • Aerobic oxidation
  • Alkene epoxidation
  • Gold catalyst
  • Peroxide generation
  • Ti-mesoporous material

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