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

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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.

Detaljer

Författare
  • Gábor Varga
  • Ákos Kukovecz
  • Zoltán Kónya
  • László Korecz
  • Szabolcs Muráth
  • Zita Csendes
  • Gábor Peintler
  • Stefan Carlson
  • Pál Sipos
  • István Pálinkó
Enheter & grupper
Externa organisationer
  • University of Szeged
  • Hungarian Academy of Sciences
Forskningsområden

Nyckelord

Originalspråkengelska
Sidor (från-till)125-134
Antal sidor10
TidskriftJournal of Catalysis
Volym335
StatusPublished - 2016 mar 1
PublikationskategoriForskning
Peer review utfördJa