In situ production of high purity noble metal nanoparticles on fumed silica and catalytic activity towards 2-nitrophenol reduction

Abstract

In-situ synthesis of chemically pure noble metal (Au, Pt, Pd, Ru) nanoparticles was performed via redox reaction under ambient conditions from aqueous noble metal salt solutions on non-porous fumed silica. Nanoparticles of average sizes < 5 and up to 19 nm were obtained. The nanostructured fumed silica with surface modified by triethoxysilane has been proven an effective support for noble metal nanoparticles synthesis. The silicon-hydride groups on the silica surface not only directly reduce noble metal ions from solution, but they also stabilize metal nanoparticles by bonding with the solid matrix. The nanocomposites were studied for the reduction of 2-nitrophenol showing very high activity at room temperature following the order Pd>Au>Ru>Pt.

Recent developments in methane decomposition over heterogeneous catalysts: an overview

“…Noble metals have an outstanding catalytic activity in the catalytic processes [129][130][131][132]. However, the use of these [44] metals as active components is restricted because of their cost.…”

Copper Oxide-Antimony Oxide Entrapped Alginate Hydrogel as Efficient Catalyst for Selective Reduction of 2-Nitrophenol

“…Alg@Cu 2 O-Sb 2 O 3 efficiently reduced 2-NP in 4.0 min until the 3 rd cycle, which suggests that Alg@Cu 2 O-Sb 2 O 3 can be used numerous times with no loss in catalytic activity. The results were compared with the literature [ 36 , 37 , 38 , 39 , 40 ], and it was fount that Alg@Cu 2 O-Sb 2 O 3 is an efficient catalyst that can be used several times. This indicate that nanocomposite can play important role as a catalyst since nanocomposites have shown an enormous range of applications in different sectors [ 41 , 42 , 43 ].…”

Ultraviolet aging study on bitumen modified by a composite of clay and fumed silica nanoparticles

“…Mechanical properties. For validation of FTIR results, the index of viscosity aging (IVA) and softening point increment (SPI) are used 31 . IVA and SPI are computed from Eqs.…”

“…Benefiting from open Braunschweig Pavement Engineering Centre, Technische Universität Braunschweig, Braunschweig, Germany. * email: g.cheraghian@tu-bs.de the specific nanostructure of clay nanolayers and fumed silica nanoparticles, the stability 30 and the reactivity 31 of nanocomposites may be significantly improved, due to their advantageous physical properties.…”