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: Research - peer-reviewArticle

    • 5 Citations

    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
    Nanoparticles
    Catalysts
    Silica
    Catalyst supports
    Calcination
    Hot Temperature
    2-pyrrolidone
    Stabilizers (agents)
    Sonication
    Argon
    Colloids
    Pyruvic Acid
    Hydrogenation
    Catalyst activity
    Metals
    Oxidation
    polyol

    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: Research - peer-reviewArticle

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