Abstract

A. ROJAS, Hugo et al. HYDROGENATION OF CITRONELLAL OVER Ir/TiO2/SiO2 CATALYSTS . Rev.Colomb.Quim. [online]. 2007, vol.36, n.2, pp.183-198. ISSN 0120-2804.

Catalytic hydrogenation of citronellal over Ir/TiO2, Ir/SiO2, and Ir supported on mixed oxides (Ir/TiO2/SiO2) reduced at 473 y 773 K was studied. The effects of the partially reducible support species, the reduction temperatures (473 K or 773 K) and the successive TiO2 addition were analyzed. The catalysts were characterized by H2 chemisorption at room temperature, N2 adsorption at 77 K, XRD, TEM and XPS. The results showed that the high temperature reduction treatment (HT: 773 K) favored the production of the unsaturated alcohol, which can be explained in terms of the so-called strong metalsupport interaction (SMSI) effect. Catalysts reduced at low temperature (LT: 473 K) mainly led to a cyclization reaction producing isopulegol. These catalysts showed high activity but low selectivity to the unsaturated alcohol.

Keywords : citronellal hydrogenation; TiO2/SiO2 support; Ir catalysts; strong metal support interaction (SMSI).

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