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  • Chem Sci Trans., 2013, 2(S1),  pp S111-S122  

    DOI:10.7598/cst2013.24

    Research Article

    TiO2 Supported Pt Based Bimetallic Nanocatalysts for Selective Hydrogenation of Citral

  • S. A. ANANTHAN, R. SURESH, K. GIRIBABU, R. MANIGANDAN and V. NARAYANAN
  • Department of Inorganic Chemistry, School of Chemical Sciences, University of Madras, Guindy Campus, Chennai-600 025, India
  • Abstract

    TiO2 supported Pt based bimetallic nanocatalysts were prepared by impregnation method and reduced at two different temperatures, 375 C and 575 C for the selective hydrogenation of citral to the corresponding unsaturated alcohols namely; geraniol (GOL) and nerol (NOL). The catalysts were characterized by BET surface area measurement, FT-IR, SEM, EDAX, TEM, XRD and XPS. The prepared nanocatalysts are uniformly dispersed with an average particles size 50-100 nm and zero valence metallic state. The SMSI (Strong Meal-Support Interaction) effect shows that the catalysts reduced at higher temperature leads to an increase in selectivity toward unsaturated alcohols (GOL & NOL) for Pt-Ru/TiO2 compared to Pt-Pd/TiO2 and Pt-Au/TiO2 nanocatalysts. In addition a second metal (Ru) also leads to an increase of the GOL & NOL selectivity during the citral hydrogenation. The generated partially oxidized second metal species due to the difference in electronegativity, strongly binds the C=O group and also paves the way for the selective activation of the C=O bond. Metal support interaction and promoter active metal interaction increased the unsaturated alcohol formation.

    Keywords

    Bimetallic nanocatalysts, TiO2 supported, SMSI effect, Thermal reduction, Citral hydrogenation, Unsaturated alcohols

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