| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 41423 | Applied Catalysis A: General | 2011 | 10 Pages |
The kinetics of the liquid-phase hydrogenation of citral (3,7-dimethyl-2,6-octadienal) on Au/TiO2 and Pt–Sn/TiO2 thin films was studied in the temperature range 313–353 K and citral concentrations of 0.25–10.0 mol m−3. The thin films were deposited onto the inner walls of silica capillaries with internal diameter of 250 μm. First-order dependence on hydrogen pressure and near zero order dependence on citral concentration were observed for the initial rate of citral hydrogenation over the Pt–Sn/TiO2 and Au/TiO2 thin films. The Au/TiO2 catalyst prevents citronellal formation. The highest yield of unsaturated alcohols was obtained on the Pt–Sn/TiO2 film at a reaction temperature of 343 K, liquid residence time of 30 min and a citral conversion of 99%.
Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (135 K)Download as PowerPoint slideHighlights► The Pt–Sn/TiO2 catalytic coating is more active and selective if to compare with Au/TiO2 one. ► The yield of unsaturated alcohols of 79% was obtained on the Pt–Sn/TiO2 thin film. ► The proposed kinetic model suitably describes the obtained experimental data. ► The reaction orders were found to be 1 for hydrogen and 0.07–0.08 for citral.
