The oxidative photo-dehydrogenation of glycerol to produce H₂ and other valuable chemicals was studied using different materials. In particular, Pt nanoparticles were deposited on microemulsion-synthesized TiO₂ via surface organometallic chemistry (SOMC) and compared with photocatalysts obtained using more conventional methods. Well-defined Pt(II) single-site titania-grafted were prepared reacting the surface hydroxyl groups of TiO₂ nano-oxides with the organometallic Pt(COD)Me₂ complex. Sample reduction under H₂ generated ultrafine Pt nanoparticles well-dispersed on titania surface. Its performance under simulated solar light showed superior activity when compared to analogous Pt-containing catalysts prepared by other methods. Improved dispersion of Pt metal on titania surface was among the primary reasons of a better overall activity, providing relatively high rates of hydrogen productivity. Moreover, an increase of glyceraldehyde productivity in liquid phase was observed with the increase of Pt dispersion, demonstrating that the metal dispersion can strongly affect the selectivity of chemicals produced in the reaction. Comparison with state of the art shows that the present material exhibits excellent performance for a combined positive effect of the high specific surface area of titania prepared by microemulsion, giving access to the increased densities of active sites and the high dispersion of Pt nanoparticles given by the SOMC technique.

研究了使用不同材料对甘油进行光催化氧化脱氢生成H ₂和其他有价值的化学物质。尤其是，Pt纳米颗粒通过表面有机金属化学（SOMC）沉积在微乳液合成的TiO ₂上，并与使用更常规方法获得的光催化剂进行了比较。TiO ₂纳米氧化物的表面羟基与有机金属Pt（COD）Me _2配合物反应制备了定义明确的Pt（II）单中心二氧化钛接枝。H ₂下的样品减少生成的超细铂纳米颗粒均匀分散在二氧化钛表面。与通过其他方法制得的类似含Pt的催化剂相比，其在模拟太阳光下的性能表现出优异的活性。Pt金属在二氧化钛表面上的分散性改善是总体活性更好的主要原因之一，提供了相对较高的氢气生产率。此外，观察到液相中甘油醛生产率随Pt分散度的增加而增加，表明金属分散体可强烈影响反应中产生的化学物质的选择性。与现有技术的比较表明，本发明的材料对于通过微乳液制备的高二氧化钛的高比表面积的综合正作用表现出优异的性能，