title: The effect of the nano-silica support on the catalytic reduction of water by gold, silver and platinum nanoparticles--nanocomposite reactivity.
abstract: Pt°-NPs, prepared by the reduction of Pt(IV) salts with borohydride, do not catalyse the reduction of water in the presence of the strongly-reducing ˙C(CH3)2OH radicals. However, supporting the same metal nanoparticles (M°-NPs) with SiO2 alters the catalytic properties enabling the reaction. This effect depends both on the nature of M° and concentration of the composite nanoparticles. At low nanocomposite concentration: for M = Au nearly no effect is observed; for M = Ag the support decreases the catalytic reduction of water and for M = Pt the support initiates the catalytic process. At high nanocomposite concentration: for M = Au the reactivity is considerably lower and for M = Ag or Pt no catalysis is observed. Furthermore, for M = Ag or Pt H2 reduces the ˙C(CH3)2OH radicals.
authors.affiliation: Department of Biological Chemistry, Ariel University, Ariel, Israel. tomerzi@ariel.ac.il.
authors.forename: T
authors.initials: T
authors.lastname: Zidki
authors.forename: R
authors.initials: R
authors.lastname: Bar-Ziv
authors.forename: U
authors.initials: U
authors.lastname: Green
authors.forename: H
authors.initials: H
authors.lastname: Cohen
authors.forename: D
authors.initials: D
authors.lastname: Meisel
authors.forename: D
authors.initials: D
authors.lastname: Meyerstein
mesh_terms: D002384:Catalysis; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008968:Molecular Conformation; D053761:Nanocomposites / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water; D012834:Silver; D010984:Platinum; D006046:Gold; D012822:Silicon Dioxide