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Catalytic and Photocatalytic Decomposition of Ozone at Room Temperature Over Titanium(IV) Oxide. -The decomposition of ozone (80 ppm in air) in the dark is found to be catalyzed by TiO2. The catalytic activity of TiO2, evaluated from the decrease in the ozone concentration, increases with increasing surface area and increasing amount of surface hydroxyl-groups. Substitution of the surface hydroxyls by fluoride ions reduces the catalytic activity to less than the half, indicating that the surface hydroxyls are involved in the O3 decomposition mechanism. Under irradiation (¿ 200 nm), ozone decomposition occurs not only by direct photolysis of O3 adsorbed at the titania surface, but also by a photocatalytic reaction initiated by absorption of photons at ¡ 400 nm, and by the dark catalytic decomposition. The photocatalytic activity of TiO2 is independent of the surface area, but strongly depends on the crystal structure. The photocatalytic activity is significantly higher for rutile than for anatase. -(OHTANI, B.; ZHANG, S.-W.; NISHIMOTO, S.; KAGIYA, T.; J. Chem. Soc.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.