Cs exchanged phosphotungstic acid as an efficient catalyst for liquid-phase Beckmann rearrangement of oximes

N. R. Shiju, H. M. Williams, D. R. Brown

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

Cs exchanged phosphotungstic acid is a highly efficient and environmentally benign solid acid catalyst for the liquid-phase Beckmann rearrangement of ketoximes to the corresponding amides. The catalysts CsxH3-xPW12O40 (x = 1.5, 2, 2.5 and 3) were prepared by a titration method. The characterization results indicated that the primary Keggin structure remained intact after exchanging the protons with Cs ions. Moreover, the Cs exchanged catalysts were insoluble and exhibited larger BET surface area than the parent acid. The catalysts exhibited high reactivity and selectivity for the formation of ε-caprolactam, the precursor of Nylon 6, from cyclohexanone oxime. The catalyst can be recovered after reaction without any structural transformation.

Original languageEnglish
Pages (from-to)451-457
Number of pages7
JournalApplied Catalysis B: Environmental
Volume90
Issue number3-4
Early online date17 Apr 2009
DOIs
Publication statusPublished - 17 Aug 2009

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