Preparation and catalysis of nano-sized eetal (Pd,Pt) catalysts deposited on Ti-containing zeolite materials by a photo-assisted deposition (PAD) method

Nano-sized metal particles (Pt and Pd) can be highly deposited on Ti-containing zeolite materials (Ti-HMS and TS-1) under UV-light irradiation using a photo-assisted deposition (PAD) method. The nano-sized metals were deposited directly on the photo-excited tetrahedrally coordinated titanium oxide moieties within the frameworks. Characterization by XAFS and TEM analysis revealed that the size of metal particles depends on the preparation methods and that the smaller sizes of metal particles were formed on the photo-deposited catalysts compared to the conventionally prepared impregnated catalysts. These nano-sized metal catalysts are useful as efficient catalysts for the various reactions such as the oxidation of CO and the direct synthesis of H2O2 from H2 and O2 under an aqueous condition.