Title: Dawson-type polyoxometalates as green catalysts for adipic acid synthesis
Abstract: Dawson-type POMs series of formula α- and β-K6P2W18O62 isomers, α1- and α2-K6P2Mo5W13O62 isomers, α-K6P2Mo6W12O62 isomer and α1-K7P2Mo5VW12O62 isomer, have been used as catalysts for the liquid phase oxidation of cyclohexanol, cyclohexanone and cyclohexanol/cyclohexanone mixture to form adipic acid in presence of hydrogen peroxide without solvent, without phase-transfer agents and without adding acid. 31P NMR spectroscopy of different POMs after cyclohexanol oxidation showed the formation of new active species that can be attributed to "peroxo-POMox" form. An adipic acid yield of 69% was obtained from the oxidation of a mixture of cyclohexanol (50%) and cyclohexanone (50%) with α-K6P2Mo6W12O62 isomer.
Publication Year: 2015
Publication Date: 2015-12-24
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 36
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