Effects of surface activation on the structural and catalytic properties of ruthenium nanoparticles supported on mesoporous silica

Xianfeng Ma, Rui Lin, Christopher Beuerle, James E. Jackson, Sherine O. Obare, Robert Y. Ofoli

Research output: Contribution to journalArticle

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Abstract

Using colloid-based methods to prepare supported catalytic metallic nanoparticles (NPs) often faces the challenge of removing the stabilizer used during synthesis and activating the catalyst without modifying the particles or the support. We explored three surface activation protocols (thermal oxidation at 150 ° C, thermal reduction at 350 ° C, and argon-protected calcination at 650 ° C) to activate ruthenium NPs supported on mesoporous silica (MSU-F), and assessed their effects on the structural and catalytic properties of the catalysts, and their activity by the aqueous phase hydrogenation of pyruvic acid. The NPs were synthesized by polyol reduction using poly-N-vinyl-2-pyrrolidone (PVP) as a stabilizer, and supported on MSU-F by sonication-assisted deposition. The NPs maintained their original morphology on the support during activation. Ar-protected calcination was the most efficient of the three for completely removing PVP from particle surfaces, and provided the highest degree of particle crystallinity and a metal dispersion comparable to commercial Ru/SiO2. Its catalytic performance was significantly higher than the other two protocols, although all three thermally activated catalysts achieved higher activity than the commercial catalyst at the same Ru loading. Post-reaction analysis also showed that the supported catalyst activated at 650 ° C retained its morphology during the reaction, which is an important requirement for recyclability.

LanguageEnglish (US)
Article number045701
JournalNanotechnology
Volume25
Issue number4
DOIs
StatePublished - Jan 31 2014

Profile

Ruthenium
Silicon Dioxide
Chemical activation
Silica
Nanoparticles
Catalysts
Catalyst supports
Calcination
Stabilizers (agents)
Sonication
Argon
Polyols
Colloids
Pyruvic Acid
Hydrogenation
Catalyst activity
Metals
Oxidation
Acids
Hot Temperature

Keywords

  • aqueous phase hydrogenation
  • colloid-based synthesis
  • polyol reduction
  • pyruvic acid
  • sonication-assisted deposition
  • thermal treatment

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

Cite this

Effects of surface activation on the structural and catalytic properties of ruthenium nanoparticles supported on mesoporous silica. / Ma, Xianfeng; Lin, Rui; Beuerle, Christopher; Jackson, James E.; Obare, Sherine O.; Ofoli, Robert Y.

In: Nanotechnology, Vol. 25, No. 4, 045701, 31.01.2014.

Research output: Contribution to journalArticle

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