Abstract: /TiO2 catalysts were prepared by microwave,composite and conventional methods and characterized by Xray diffraction (XRD),N2 sorption analysis apply ing BET method,UVVis diffuse reflection spectroscopy(DRS) and laser Raman spec trum.The effect of different preparation methods on photocatalytic oxidation of C2H4 in air stream was studied.The results showed that the photocatalytic activi ty was obviously increased by the microwave method.The conversion of ethylene wa s 80％ contrast to those of composite and conventional methods being only 58％ a nd 41％,respectively.The catalyst by microwave method exhibited higher content o f anatase,higher specific surface area,larger band gap.The Raman scattering shif ted to low wave number direction helped to increase the transition probability o f photongenerated electrons and improved photoefficiency.

Key words: Nano-titania, Photocatalytic oxidation, Microwave, Ethylene