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

Research output: Contribution to journalArticle

Abstract

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.

Details

Authors
  • Gábor Varga
  • Ákos Kukovecz
  • Zoltán Kónya
  • László Korecz
  • Szabolcs Muráth
  • Zita Csendes
  • Gábor Peintler
  • Stefan Carlson
  • Pál Sipos
  • István Pálinkó
Organisations
External organisations
  • University of Szeged
  • Hungarian Academy of Sciences
Research areas and keywords

Keywords

  • Catalytic properties in oxidation reactions, Methods of synthesis, Mn(II)-amino acid complexes in CaAl-LDH, Structural characterization
Original languageEnglish
Pages (from-to)125-134
Number of pages10
JournalJournal of Catalysis
Volume335
Publication statusPublished - 2016 Mar 1
Publication categoryResearch
Peer-reviewedYes