A Facile Synthesis of Nearly Monodisperse Ruthenium Nanoparticles and Their Catalysis in the Hydrolytic Dehydrogenation of Ammonia Borane for Chemical Hydrogen Storage.

Can H., Metin Ö.

NanoFormulation2012, Barcelona, İspanya, 28 Mayıs - 01 Haziran 2012

  • Yayın Türü: Bildiri / Yayınlanmadı
  • Basıldığı Şehir: Barcelona
  • Basıldığı Ülke: İspanya
  • Atatürk Üniversitesi Adresli: Evet

Özet

A facile method for the preparation of nearly monodisperse Ru nanoparticles (NPs) and their record catalytic activity in the hydrolytic dehydrogenation of ammonia borane (AB) for chemical hydrogen storage are reported herein. Ru NPs were prepared by a novel protocol comprising the thermal decomposition and concomitant reduction of ruthenium(III) acetylacetonate (Ru(acac)3) in the presence of oleylamine (OAm) and benzylether (BE). In the protocol, OAm served as both a stabilizer and reducing agent and BE used as a solvent. Ru NPs were supported on aluminum oxide nanopowder (Ru@Al2O3) via a simple liquid impregnation method before their use as catalyst for the dehydrogenation of AB in water. Without any special treatment to remove the surfactants, Ru@Al2O3 showed high catalytic activity in the hydrolytic dehydrogenation of AB providing an initial turnover frequency (TOF) of 39.6 mol H2.(mol Ru.min)-1. Their catalytic performance was further enhanced dramatically by the acetic acid treatment and the initial TOF value is increased to 83.3 mol H2.(mol Ru.min)-1 that is the highest among the Ru catalysts and even higher than Pt-based catalysts tested in the hydrolysis of AB. Additionally, the work reported here includes a wealthy collection of kinetic data to determine the rate law and apparent activation parameters for the catalytic dehydrogenation of AB in water.