CeO2-doped nanostructured materials as a support of Pt catalysts:chemoselective hydrogenation of crotonaldehyde

摘要

An improvement of the catalytic activity and selectivity for the selective hydrogenation of the carbonyl bond in crotonaldehyde has been observed by addition of a dopant cation(Zn~(2+).Tb~(3+),Ti~(4+).Nb~(5+))to Pt/CeO2 mesostructured catalysts.A linear correlation between the yield to crotyl alcohol and the polarizability of the doping cation is reported.The formation of new catalytic active sites at the metal-support interphase favoring the polarization of the C = O bond of crotonaldehyde has been observed by FTIR spectroscopy.A correlation between the amount of these sites and the initial selectivity to crotyl alcohol is discussed.