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不同温度下对Pd膜表面进行了氧气毒化,并将毒化后的Pd膜在常温下与氢气进行反应,采用XPS、SEM、XRD等对反应前后Pd膜表面状态进行了表征与分析,研究了O2的毒化作用与吸氢反应对Pd膜表面形貌与化学成分的影响。结果表明:当毒化温度低于240℃时,氧原子在Pd膜表面的吸附量随毒化温度升高而增加,但无明显PdO生成;当毒化温度高于240℃时,在Pd膜表面生成了PdO并伴有微孔出现,随着毒化温度升高,PdO含量、微孔数量、微孔体积逐渐增加。在390℃毒化1h后,Pd膜表面完全形成PdO;所有试样在室温下与氢气反应1h后吸附态氧原子与PdO完全消失。Pd膜表面化学成分被完全还原成反应前状态,而多孔形貌得到一定的保留,240℃及以上温度毒化后的Pd膜与氢气反应后产生明显塑性变形。
The surface of Pd film was poisoned by oxygen at different temperatures, and the poisoned Pd film was reacted with hydrogen at room temperature. The surface state of Pd film before and after reaction was characterized and analyzed by XPS, SEM and XRD. The effects of O2 Effect of hydrogenation on Pd surface morphology and chemical composition. The results show that when the poisoning temperature is lower than 240 ℃, the adsorption amount of oxygen atoms on the surface of Pd film increases with the increase of poisoning temperature, but no obvious PdO is formed. When the poisoning temperature is higher than 240 ℃, With the increase of poisoning temperature, the content of PdO, the number of micropores and the volume of micropores increased gradually. After being poisoned at 390 ℃ for 1h, the surface of Pd film was completely formed with PdO. After all the samples were reacted with hydrogen for 1h at room temperature, the adsorbed oxygen atoms and PdO completely disappeared. Pd surface chemical composition was completely reduced to the pre-reaction state, while the porous morphology to some retention, 240 ℃ and above the temperature of the Pd film poisoned after reaction with hydrogen to produce significant plastic deformation.