Revista Colombiana de Química
Print version ISSN 0120-2804
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.