Abstract
Pt/ x%Ti-SBA15 catalysts ( x corresponding to the wt.% TiO 2 loading in the Ti–SiO 2 composite, in the range 25–60%) were synthesized by titanium precursor grafting in preformed mesoporous silica. Materials were characterized by several techniques, including elemental analysis, XRD, TEM and N 2-sorption isotherms to achieve structural and textural properties description. Different pore sizes were obtained for the SBA-15 materials, by using or not hexane as swelling agent. The catalytic performances of these original materials were evaluated for the selective hydrogenation of citral (α,β-unsaturated aldehyde), and compared with those of Pt/SBA and Pt/TiO 2 P25 reference catalysts. Pt/ x%Ti-SBA15 catalysts present high specific surface, with TiO 2 nanoparticles and Pt 0 clusters located inside the hexagonal mesopore structure of silica. During citral hydrogenation, the selectivity towards unsaturated alcohols (nerol and geraniol) varies as a function of the support nature as follows: Pt/ x%Ti-SBA15 > Pt/TiO 2 P25 ≫ Pt/SBA. The results are discussed in term of variable metal-support interaction (SMSI) generated by the partial reduction of TiO 2 species, this SMSI effect being reported more important over anatase TiO 2 nanoparticles dispersed inside the mesostructure than over large crystals encountered in the classical P25 support.
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