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Abstract
We studied gold catalysts supported on three different metallic oxides as the nature of the support could determine the type of active sites needed to carry out the selective hydrogenation reactions of α,β-unsaturated aldehydes. The hydrogenation of cinammaldehyde was studied as reaction test. The cinnamaldehyde has two preferential adsorption possibilities (vertical atop and planar) and, therefore, if there are charged gold species, the preferential adsorption may be detected. The results suggested that the presence of intermediates particles (~5,7 nm) and Auδ¯ sites can be necessary to increase the selectivity towards the reduction of the C=O group. This behavior was preferentially seen on the Au/SiO2 catalyst. In the Au/Fe2O3 and Au/TiO2 catalysts, where other metal-support interactions are possible, the selectivity decreased possibly due to the adsorption modes of cinnamaldehyde in planar and vertical atop geometry, which may be explained by the size of the Au° particles: ~9,8 nm and ~4,5 nm, respectively.
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