Temperature dependence of the photochemical reduction of CO2in the presence of H2Oat the solid/gas interface of TiO2

摘要: The photochemical reduction of CO2 at a TiO2 surface in the presence H2O has been investigated. CO, CH4, H2, and some higher hydrocarbons CnHm, attributed to C2H6, could be detected as photoproducts by mass spectrometry. No oxidation products found. temperature dependence reaction was investigated between 25 200 °C. rate increases with increasing indicating that thermal step is limiting this range. A model comprising heat adsorption reactants used calculate an apparent activation energy (Ea) for CH4 formation. At room value ca. 2 kJ mol−1 found Ea. This decreases almost zero During course Ea tends increase which indicates product desorption step.