Magnetic gold nanocatalyst (nanocat-Fe-Au): Catalytic applications for the oxidative esterification and hydrogen transfer reactions

Manoj B. Gawande, Anuj K. Rathi, Jiri Tucek, Klara Safarova, Nenad Bundaleski, Orlando M N D Teodoro, Libor Kvitek, Rajender S. Varma, Radek Zboril

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

An efficient and sustainable protocol is described for the oxidative esterification of aldehydes and the reduction of aromatic nitro compounds that uses a magnetically separable and reusable maghemite-supported gold nanocatalyst (nanocat-Fe-Au) under mild conditions. The complex chemical, morphological, structural and size analyses, including e.g. XPS, HRTEM, in-field Mössbauer spectroscopy and HRTEM, revealed that the hybrid material is composed of a well-defined stoichiometric maghemite support (20-30 nm) decorated with ultrasmall (5-6 nm) gold nanoparticles. The hybrid catalytic system containing 4 wt% of nanogold has been generated using simple impregnation methods in aqueous medium from readily available starting materials and was recycled five times without any significant loss in catalytic activity; high yields, 40-95% and 83-94% for oxidative esterification and reduction reactions, respectively, were obtained.

Original languageEnglish
Pages (from-to)4137-4143
Number of pages7
JournalGreen Chemistry
Volume16
Issue number9
DOIs
Publication statusPublished - Sep 2014

Keywords

  • MULTICOMPONENT REACTIONS
  • SELECTIVE OXIDATION
  • CARBONYL-COMPOUN DS
  • COATED MAGHEMITE
  • AQUEOUS-MEDIA
  • SULFONIC-ACID
  • SOLVENT-FREE
  • NANOPARTICLES
  • CHEMISTRY
  • OXIDE

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