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., ...More

CHEMISTRYSELECT, vol.2, no.8, pp.2487-2494, 2017 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 2 Issue: 8
  • Publication Date: 2017
  • Doi Number: 10.1002/slct.201700124
  • Journal Name: CHEMISTRYSELECT
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED)
  • Page Numbers: pp.2487-2494
  • Keywords: lignin, nanoparticles, polyoxometalate, ruthenium, veratryl alcohol, METAL NANOPARTICLES, RENEWABLE CHEMICALS, AMMONIA-BORANE, CATALYST, TRANSFORMATION, COMPLEXES, DIOXYGEN, BIOMASS, SYSTEM, ROUTES
  • Van Yüzüncü Yıl University Affiliated: Yes

Abstract

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.