Abstract

ROJAS SARMIENTO, Hugo Alfonso et al. SELECTIVE HYDROGENATION OF CITRAL IN LIQUID PHASE OVER Ir-Fe/TiO₂ REDUCED AT HIGH TEMPERATURE. Rev.Colomb.Quim. [online]. 2005, vol.34, n.2, pp.127-138. ISSN 0120-2804.

The citral hydrogenation was studied over Ir-Fe/TiO₂ catalysts reduced at 773 K (HTR: high temperature reduction). The catalysts synthesis was made using H₂IrCl₆ aqueous solution to get ca. 1% wt Ir load and by impregnating FeCl₃ solution to obtain bimetallic catalysts. The results showed that all of the studied Ir/TiO₂ and Fe-Ir/TiO₂ catalysts display high selectivities (ca. 100%) towards the unsaturated alcohols (geraniol and nerol) during citral hydrogenation. Solids were charac-terized by selective H2 chemisorption, XRD, TPR and XPS. Intrinsic activity and selectivity data are explained in agreement to the characterization results showing the metal support interaction effect (SMSI). Also is showed the description of a reactor STR (stirred tank reactor) for the evaluation of the intrinsic catalytic activity.

Keywords : Citral hydrogenation; Ir catalyst; Ir Fe catalysts; TiO₂ support; SMSI.

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