【摘要】 用红外光谱技术对Pt/ZnO体系的CO吸附态作了初步考察。观察到该体系的CO吸附态以线式(～2060cm^-1)和桥式(～1860em^-1)存在。发现氢处理或抽空处理后Pt/ZnO上的CO吸附主峰的强度逐渐变弱,且随时间的延长,该峰发生“紫移”。这些现象与Pt/TiO₂体系的相类似,不同的是Pt—ZnO间产生强相互作用的处理温度比Pt—TiO₂之间低得多。两种体系均同样存在“氢溢流”现象。更多还原

【Abstract】 The properties of adsorbed CO on Pt/ZnO were explored using IR Spectroscopy.It was observed that the adsorbed CO existed as linear(～2060cm^-1) and bridged(～1860cm^-1) species.It was found that the intensity of the main band of adsorbed CO on Pt/ZnO gradually weakened after hydrogen or evacuation treatment,and that along with the duration the band exhibited a "violet shift". These phenomena were similar to those observed with Pt/TiO₂ system,with only the difference that the treating temperature at which the strong metal-support interaction occured between Pt and ZnO was much lower than that found between Pt and TiO₂.For both the systems, the "hydrogen spillover" was observed.更多还原