Borate-containing layered double hydroxide composites: synthesis, characterization and application as catalysts in the Beckmann rearrangement reaction of cyclohexanone oxime

Gábor Varga, Szabolcs Muráth, Áron Bajcsi, Á. Kukovecz, Zoltán Kónya, Pál Sipos, István Pálinkó

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Boron-containing CaAl-layered double hydroxides (LDHs) were prepared by milling, as well as the dehydration–rehydration and the anion-exchange methods. The substances obtained were structurally characterized by powder X-ray diffraction measurements, scanning electron microscopy and infrared spectroscopy. Various borate species could be introduced among the layers and/or the outer surface of the CaAl-LDH. The materials were tested as catalysts in the Beckmann rearrangement of cyclohexanone oxime to ε-caprolactam in the liquid phase, at 373 K. Two of them, the samples prepared by dehydration–rehydration and anion exchange, proved to be active, selective and recyclable catalysts, while the one made by the mechanochemical method was practically inactive. The catalytic activity was tied to intercalated and/or surface-bonded triborate and tetraborate species.

Original languageEnglish
Pages (from-to)1-14
Number of pages14
JournalReaction Kinetics, Mechanisms and Catalysis
DOIs
Publication statusAccepted/In press - Jan 19 2017

Keywords

  • Beckmann rearrangement as test reaction
  • Borate–CaAl-LDH composites
  • Structural characterization
  • Wet and mechanochemical synthesis methods

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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