Surface Reactions on MoO3 Induced by Tunable Pulse Infrared Free Electron Laser

We have carried out ethanol conversion reactions on the MoO3 under the pulse infrared irradiations (period = 2 s) with several wavelengths emitted from free-electron-laser. We found a piece of evidence to show the dependence of activities in the ethanol conversion rate on the infrared wavelengths. When the wavelength was tuned to 967 cm^-1, which corresponded to the absorption frequency of 0.167 nm Mo=O bond, C2H5OH was converted mainly to C2H4 with CH3CHO as a minor product while no reaction occurred at 1200 cm^-1 where no resonant vibration mode of MoO3 was present. The reaction products were different from those produced in thermal reactions.