Abstract
The hydrogenation of citronellal was investigated with Ru/TiO 2 and Ru/SiO 2 catalysts, prepared from different precursors at various activation temperatures. Ru/TiO 2 was the more active catalyst reaching maximum carbonyl selectivity when activated at 773 K, while Ru/SiO 2 became selective at much higher activation temperatures, but at the cost of activity. Both phenomena are related to the occurrence of H-spillover on TiO 2 supported catalysts and to the absence of contaminating C1 on catalysts activated at high temperature.
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