Keggin Type-Polyoxometalate Decorated Ruthenium Nanoparticles: Highly Active and Selective Nanocatalyst for the Oxidation of Veratryl Alcohol as a Lignin Model Compound


Baguc I. B. , Saglam S., Ertas I. E. , Keles M. N. , Çelebi M. , KAYA M., ...Daha Fazla

CHEMISTRYSELECT, cilt.2, ss.2487-2494, 2017 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 2 Konu: 8
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1002/slct.201700124
  • Dergi Adı: CHEMISTRYSELECT
  • Sayfa Sayıları: ss.2487-2494

Özet

Described herein is a new nanocatalyst system that efficiently works in the aerobic oxidation of veratryl alcohol (VA), which is formed by cleavage of beta-O-4 linkages in lignin, to veratraldehyde (VAL) under mild reaction conditions. The new nanocatalyst system comprised of ruthenium(0) nanoparticles supported on the Keggin type polyoxometalate (POM; K-3[PMo12O40]) network (Ru/POM) can simply and reproducibly be prepared by the dimethylamine-borane ((CH3)(2)NHBH3) reduction of ruthenium(III) chloride trihydrate (RuCl3.3H(2)O) in isopropanol solution of K-3[P Mo12O40] at room temperature. The characterization of Ru/POM by the combination of various analytical techniques reveals that the formation of well-dispersed ruthenium(0) nanoparticles with a mean diameter of 4.7 +/- 1.2nm on the surface of POM network structure. This new Ru/POM nanocatalyst displays remarkable activity (TOF=7.5mol VAld/mol Ru x h) at high selectivity (> 98%) and almost complete conversion (98%) in the aerobic oxidation of VA to VAld under mild conditions.