(68f) Nitrogen Doped TiO2 Catalysts for Gas-Phase Visible Photo Catalysis Synthesized by Flame Technique

In recent years there has been an increasing interest in developing catalysts for visible light photocatalytic degradation of volatile organic compounds. Compared to other dopants, N doped TiO₂ catalysts shown higher efficiency in utilizing the visible light of the solar spectrum. So far, several wet methods have been employed for synthesizing N doped TiO₂ materials. The Flame Spray Pyrolysis (FSP) technique has better control on crystal structure, particle size and its distribution compared to the wet methods. The present study mainly aimed at developing N doped TiO₂ materials using flame technique for the destruction of VOCs in the gas phase. For this purpose, various nitrogen doped TiO₂ catalysts are synthesized by FSP method using different nitrogen sources like NH₄Cl, CH₄N₂O, NH₄NO₃, CH₅N, C₃H₉N, (NH₄)₂CO₃ , and CH₂N₂. A combination of various physico-chemical characterizations such as N₂ physisorption, O₂ chemisorption, X-ray diffraction (XRD), diffuse reflectance UV-vis (DR UV-vis), FT-IR, Raman, and temperature program reduction (TPR) were used to characterize the chemical environment of these materials. The UV-vis spectroscopy results of N incorporated TiO₂ showed enhancement of light absorption in the visible range by selected composite materials in the UV range (250-400 nm). Catalytic activity measurements show that the activity of N doped TiO­₂ depends on the precursor used. These interesting results will be discussed in the presentation.