Abstract
The thermal desorption spectra of propene and oxygen adsorbed on blue tungsten oxide WO2.90 have been measured by means of flash heating the sample in ultra high vacuum. It has been discovered that at room temperature only one adsorption state of propene on blue tungsten oxide surface exists, which corresponds to a desorption peak at the temperature around 100℃ appeared in the thermal desorption spectra. The desor- ption parameters determined by the experiment are: n=l (first order desorption) and the activation energy of desorption Ed=10.1 kcal/mol. The probability of forming stable adsorption state of propene on blue tungsten oxide decreases as the sample temperature increases. At room temperature, the blue tungsten oxide doesn't interact with oxygen significantly. But after raising the temperature to above 300℃, WO2.90 is oxidized into WO3 accompanying with a strong adsorption of oxygen. This implies that the blue tungsten oxide could be used as a promising oxygen getter in the vacuum valves.
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