Materials of high specific surface area are promising for catalysis and photocatalysis as an efficient support for metal nanoparticles which often demonstrate the tendency to agglomeration on heating. Inorganic nanotubes are one of rather new types of materials which are intensively studied during last ten years. Such materials pose the unique types of structure and special porosity because of inner hollows and grain boundaries. The specific surface area of titania nanotubes reaches 400 m^2/g which is not the record value but could be enough. The diameter of inner cavities is about 5 nm, the outer diameter is about 10 nm. Titania nanotubes degrade above 400°C as a result of dehydratation process leading to nanocrystalline anatase.     

Platinum, gold and silver nanoparticles were deposited onto TiO₂ nanotubes using deposition-precipitation and wet-impregnation techniques. Nanocomposites were characterized using TEM, XPS, BET, TPR-H₂ methods. All the experiments we performed in an excess of oxygen to CO. Catalytic activity of materials was studied in CO oxidation model process. Photocatalytic activity of the probes was analyzed by methyl-orange and brilliant green decomposition.

We showed that the deposition technique influences strongly on the catalytic and photocatalytic activities of nanocomposites. Sodium percentage in TiO₂ nanotubes is critical for both catalytic and photocatalytic activities of materials.  

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