Photocatalytic Decomposition of Gaseous Acetone Using TiO2 and Pt/TiO2 Catalysts

摘要

Metallic platinum was photodeposited on TiO2 particles,and morphological characteristics of the Pt/TiO2 catalyst were determined.The dispersion of metallic platinum was uniform and did not alter the morphology of the TiO2 particles.However,absorbance of the Pt/TiO2 catalyst for light with wavelength more than 400 nm was significantly improved by the addition of metallic platinum.Gaseous acetone was decomposed in an annular photoreactor coated with TiO2 or Pt/TiO2 catalysts using a UV or a fluorescent lamp as light source.The decomposition of acetone with the application of a UV lamp was obviously enhanced for experiments conducted with Pt/TiO2 catalyst.Decomposition of acetone was promoted considerably with increasing oxygen concentration for experiments conducted with oxygen less than 50,000 ppmv,yet the decomposition of acetone was kept relatively constant for experiments conducted with oxygen above 50,000 ppmv.On the basis of the mass balance for carbon species,the amount of organic intermediates formed for experiments conducted under various conditions was found to be minimal.