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Mn(II)-amino acid complexes intercalated in CaAl-layered double hydroxide - Well-characterized, highly efficient, recyclable oxidation catalysts

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Author

  • Gábor Varga
  • Ákos Kukovecz
  • Zoltán Kónya
  • László Korecz
  • Szabolcs Muráth
  • Zita Csendes
  • Gábor Peintler
  • Stefan Carlson
  • Pál Sipos
  • István Pálinkó

Summary, in English

Intercalated composite materials were prepared with CaAl-layered double hydroxide as the host and Mn(II)-amino acid (l-cysteine, l-histidine and l-tyrosine) complex anions as the guest. Two methods (intercalation of the ligand first followed by constructing the complex; preforming the complex first, then introducing it among the layers of the host) and optimization of the auxiliary conditions were performed to arrive at composites having the complex exclusively among the layers. The obtained substances were structurally characterized by powder X-ray diffractometry, mid IR spectroscopy in diffuse reflectance mode and with ATR or photoacoustic detections, and scanning electron microscopy. The structural features of the intercalant (coordination number, coordination sites) were elucidated by classical chemical and energy dispersive X-ray analyses, EPR, X-ray absorption and far IR spectroscopies. Structural models are also given. The catalytic activities, selectivities and recycling abilities of the substances were studied in the oxidation reactions of cyclohexene with peracetic acid and in situ formed iodosylbenzene as oxidants and allylic alcohol with peracetic acid, in the liquid phase. The intercalated substances proved to be efficient and highly selective (with peracetic acid: outstanding epoxide, with iodosylbenzene superior diol selectivities) catalysts with very good recycling abilities.

Department/s

Publishing year

2016-03-01

Language

English

Pages

125-134

Publication/Series

Journal of Catalysis

Volume

335

Document type

Journal article

Publisher

Elsevier

Keywords

  • Catalytic properties in oxidation reactions
  • Methods of synthesis
  • Mn(II)-amino acid complexes in CaAl-LDH
  • Structural characterization

Status

Published

ISBN/ISSN/Other

  • ISSN: 0021-9517