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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)具有极强的吸氧能力,同时本身被氧化成WO_3。这一现象有可能使蓝色氧化钨被用于电真空器件中作为一种氧的消气剂。
The thermal desorption spectra of blue tungsten oxide WO_ (2.90) adsorbing propylene and oxygen were determined by flash-heating the sample under ultra-high vacuum conditions. At room temperature, propylene was found to have only one adsorbed state on the blue tungsten oxide surface, corresponding to a desorption peak near 100 ° C in the thermal desorption spectrum. Experimental determination of thermal desorption parameters n = 1 (first desorption), desorption activation energy E_d = 10.1kcal / mol. As the temperature increases, the propensity of propylene to form a stable adsorption state on the blue tungsten oxide decreases. Above 125 ℃, the stable adsorption state can not be formed. The blue tungsten oxide has not obvious oxygen adsorption at room temperature. When the temperature rises above 300 ℃, WO_ (2.90) has strong oxygen absorption capacity, Oxidation to WO_3. This phenomenon makes it possible for blue tungsten oxide to be used as an oxygen getter in electrical vacuum devices.