III International Conference

PP-III-52PHOTOCATALYTIC REMOVAL OF NITROGEN OXIDE FROM AIR ON BULKAND ALUMINA-SUPPORTED TiO 2Shelimov B., Tolkachev N., Tkachenko O., Stakheev A., Kazansky V.N.D. Zelinsky Institute of Organic Chemistry Russian Academy of Science, Moscow, RussiaE-mail: nick33@ioc.ac.ruAlumina-supported TiO 2 samples with Ti loadings 3-96 wt % of were prepared by sol-geland incipient wettness impregnation methods. The samples were characterized by XAFS andUV-Vis techniques. An anatase-like phase was present at higher Ti content (>50 %), whereasfor Ti-loadings 50 wt%) in TiO 2 /Al 2 O 3 , an anatase-like phase with CN = 6 is formedwhich is stable up to 500 ºC. As the Ti content diminishes from 23 to 3 wt%, the CNgradually decreases and a blue shift of the UV-light absorption edge increases. Most likely, Tiions in such samples have different coordination numbers. In Ti-ZSM-5 obtained by CVD,the CN of Ti ions is close to 4, and the degree of their dispersion is highest. Isolated Ti ions orsmall clusters are predominant in these samples.Bulk titania Degussa P-25 and TiO 2 /Al 2 O 3 with Ti content 10, 20 and 50 wt % of Ti weretested in flow experiments on photocatalytic NO elimination from a gas mixture of NO(50 ppm), O 2 (8 vol. %) and N 2 (balance) at atmospheric pressure under irradiation of two568