Styrene oxide transformation on SiO2-stabilised Ag nanoparticles prepared by gamma-radiolysis

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Abstract

Ag nanoparticles have been prepared by gamma-radiolysis of AgNO3 in aqueous matrix of SiO2 (Aerosil 200) in the presence of 2-propanol as OH radical scavenger. The presence of SiO2 prevents rapid agglomeration of Ag and the Ag nanoparticles formed become attached to SiO2. Transmission electron microscope (TEM), XRD and UV-vis measurements have shown that by adjusting the SiO2/solvent ratio the size of Ag nanoparticles can be controlled. Decreasing solvent/SiO2 ratio and high dose rate facilitated formation of small particles of 2-6 nm on SiO2. The in situ generation of Ag particles on silica has been attributed to the participation of solvated electrons formed at the silica/solvent interfacial layer. The Ag/SiO2 catalysts were tested in transformation of styrene oxide in hydrogen/He stream. The main reaction pathway is removal of oxygen. The low yield of aldehyde and alcohol can be attributed to low surface coverage of hydrogen on Ag.

Original languageEnglish
Pages (from-to)41-48
Number of pages8
JournalApplied Catalysis A: General
Volume293
Issue number1-2
DOIs
Publication statusPublished - Sep 28 2005

Fingerprint

styrene oxide
Radiolysis
Silicon Dioxide
Styrene
Nanoparticles
Oxides
Hydrogen
Silica
2-Propanol
Propanol
Aldehydes
Alcohols
Electron microscopes
Agglomeration
Oxygen
Catalysts
Electrons

Keywords

  • Ag nanoparticles
  • Catalysis
  • Gamma-irradiation
  • Styrene oxide hydrogenation
  • TEM
  • UV-vis

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

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title = "Styrene oxide transformation on SiO2-stabilised Ag nanoparticles prepared by gamma-radiolysis",
abstract = "Ag nanoparticles have been prepared by gamma-radiolysis of AgNO3 in aqueous matrix of SiO2 (Aerosil 200) in the presence of 2-propanol as OH radical scavenger. The presence of SiO2 prevents rapid agglomeration of Ag and the Ag nanoparticles formed become attached to SiO2. Transmission electron microscope (TEM), XRD and UV-vis measurements have shown that by adjusting the SiO2/solvent ratio the size of Ag nanoparticles can be controlled. Decreasing solvent/SiO2 ratio and high dose rate facilitated formation of small particles of 2-6 nm on SiO2. The in situ generation of Ag particles on silica has been attributed to the participation of solvated electrons formed at the silica/solvent interfacial layer. The Ag/SiO2 catalysts were tested in transformation of styrene oxide in hydrogen/He stream. The main reaction pathway is removal of oxygen. The low yield of aldehyde and alcohol can be attributed to low surface coverage of hydrogen on Ag.",
keywords = "Ag nanoparticles, Catalysis, Gamma-irradiation, Styrene oxide hydrogenation, TEM, UV-vis",
author = "A. S{\'a}rk{\'a}ny and I. Saj{\'o} and P. Hargittai and Z. Papp and E. Tomb{\'a}cz",
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T1 - Styrene oxide transformation on SiO2-stabilised Ag nanoparticles prepared by gamma-radiolysis

AU - Sárkány, A.

AU - Sajó, I.

AU - Hargittai, P.

AU - Papp, Z.

AU - Tombácz, E.

PY - 2005/9/28

Y1 - 2005/9/28

N2 - Ag nanoparticles have been prepared by gamma-radiolysis of AgNO3 in aqueous matrix of SiO2 (Aerosil 200) in the presence of 2-propanol as OH radical scavenger. The presence of SiO2 prevents rapid agglomeration of Ag and the Ag nanoparticles formed become attached to SiO2. Transmission electron microscope (TEM), XRD and UV-vis measurements have shown that by adjusting the SiO2/solvent ratio the size of Ag nanoparticles can be controlled. Decreasing solvent/SiO2 ratio and high dose rate facilitated formation of small particles of 2-6 nm on SiO2. The in situ generation of Ag particles on silica has been attributed to the participation of solvated electrons formed at the silica/solvent interfacial layer. The Ag/SiO2 catalysts were tested in transformation of styrene oxide in hydrogen/He stream. The main reaction pathway is removal of oxygen. The low yield of aldehyde and alcohol can be attributed to low surface coverage of hydrogen on Ag.

AB - Ag nanoparticles have been prepared by gamma-radiolysis of AgNO3 in aqueous matrix of SiO2 (Aerosil 200) in the presence of 2-propanol as OH radical scavenger. The presence of SiO2 prevents rapid agglomeration of Ag and the Ag nanoparticles formed become attached to SiO2. Transmission electron microscope (TEM), XRD and UV-vis measurements have shown that by adjusting the SiO2/solvent ratio the size of Ag nanoparticles can be controlled. Decreasing solvent/SiO2 ratio and high dose rate facilitated formation of small particles of 2-6 nm on SiO2. The in situ generation of Ag particles on silica has been attributed to the participation of solvated electrons formed at the silica/solvent interfacial layer. The Ag/SiO2 catalysts were tested in transformation of styrene oxide in hydrogen/He stream. The main reaction pathway is removal of oxygen. The low yield of aldehyde and alcohol can be attributed to low surface coverage of hydrogen on Ag.

KW - Ag nanoparticles

KW - Catalysis

KW - Gamma-irradiation

KW - Styrene oxide hydrogenation

KW - TEM

KW - UV-vis

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