Preliminary Study On MPV Reduction Of Citronellal To Citronellol Catalysed By ZrO₂/γ-Al₂O₃/γ-AL₂03

Now, there is an increasing demand for efficient and clean organic syntheses, and selectivity and recycling are the keys to achieve this. The selective reduction of carbonyl compounds in the presence of other functional groups is one of the most widely practised operations in synthetic organic, fine and perfumery chemical industries. There are large unsaturated aldehyde, especially citral, citronellal and cinnamaldehyde, in natural fine oil produced in Guangxi. The unsaturated alcohols from reduction of these unsaturated aldehydes are important intermediates in synthetic organic, medicine, fine and perfumery chemical industries. It is very important work to seek new method, new catalysts and new reagents which offer greater activity, selectivity and reusability on theory and application.On the basis of progressing review on selective reduction of unsaturated aldehydes to related unsaturated alcohols catalysed heterogeneous catalysts, The theory, about different second component oxides were introduced purposely to adjust the physicochemical properties, especially catalytic properties of single oxide, was used to sieve heterogeneous catalysts which can be used to catalyze the MPV reduction of citronellal to citronrllol preliminarily. In ZrO-2/γ-Al-20-3 and La-2O-3/γ-Al-2O-3 samples, effect of calcination temperature and the second component content for catalyticLa203/ i' -A1203 ~ Zr021 y -A1203 {~{L~~ MPV*~J~15~J~Sreactivity and selectivity of MPV reduction of citronellal to citronellol were studied. Those complex oxides catalysts showed more higher reactivity than single oxide catalysts in the reaction.