蓝色氧化钨吸附丙烯和氧的热脱附谱

在超高真空条件下,用对样品进行闪烁加热的方法测定了蓝色氧化钨WO_2.90吸附丙烯和氧的热脱附谱。发现在室温下,丙烯在蓝色氧化钨表面只有一个吸附态,对应于热脱附谱中在100℃附近出现一个脱附峰。实验测定的热脱附参数为n=1(一级脱附),脱附活化能E_D=10.1kcal/mol。温度升高,丙烯在蓝色氧化钨表面形成稳定吸附态的几率减小。在125℃以上,不能形成稳定的吸附态,蓝色氧化钨在室温下对氧的吸附并不明显,温度升高到300℃以上,WO_2.90 关键词：

THERMAL DESORPTION SPECTRA OF PROPENE AND OXYGEN ADSORBED ON BLUE TUNGSTEN OXIDE

The thermal desorption spectra of propene and oxygen adsorbed on blue tungsten oxide WO_2.90 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 E_d=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℃, WO_2.90 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.