433768 N Doped TiO2 for Photocatalytic Oxidation of CO in Visible Region Synthesized By Novel One Step Liquid Flame Spray Pyrolysis (LFSP): Kinetics and Mechanism

Tuesday, November 10, 2015: 9:00 AM
255F (Salt Palace Convention Center)
Siva Nagi Reddy Inturi, Chemical Engineering Program, School of Energy, Environmental, Biological & Medical Engineering, University of Cincinnati, cincinnati, OH, Makram Suidan, Engineering collage and Architecture, American university of beirut, beirut, Lebanon and Panagiotis Smirniotis, Chemical Engineering Program, School of Energy, Environmental, Biological and Medicinal Engineering, University of Cincinnati, Cincinnati, OH

The effects of nano sized N doped TiO2 catalyst on the visible light photocatalytic oxidation of gaseous CO were investigated. A series of N-TiO2 catalyst of nanosized crystals with high monodispersity and dimensional homogeneity are synthesized by using the novel single step Liquid Spray pyrolysis (LFSP) method. In order to improve the visible light response and to further narrow the band bap of TiO2 catalyst, nitrogen is used as the dopant in this method. Different quantities of N was incorporated into TiO2 catalyst, which is beneficial to the generation of the successive energy bands inside the TiO2 band gap. Our XPS results indicate that the nitrogen doping concentration could reach to 1.31 wt% owing to the homogeneous doping in the mesoporous TiO2 catalysts. The nitrogen doped TiO2 catalyst exhibit such excellent characteristics as high specific area, relatively small particle size, pure anatase phase and excellent UV-vis absorption capacity in the range of 400-800 nm, which are all beneficial to the photocatalytic oxidation of CO under the visible light irradiation. The photoconversion of CO to CO2 is quantitative in the presence of O2. The photocatalytic CO oxidation rates and the amounts of N deposited on TiO2 surface show a close correlation. The CO photooxidation is strongly inhibited in the absence of O2 or in the presence of alternative oxidants such as H2O. The addition of water vapor dose not affects significantly the CO photooxidation kinetics in the presence of O2. The main oxidants in CO Photocatalytic oxidation seem to be produced from adsorbed O2. The photocatalytic oxidation kinetics was investigated in detail as a function of N loading, coated TiO2 mass, CO concentration, O2 concentration, light intensity, additives, and humidity. These interesting results will be discussed in the presentation.

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See more of this Session: Fundamentals of Environmental Kinetics and Reaction Engineering
See more of this Group/Topical: Environmental Division