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研究了CO和H2 在Cu ZnO基催化剂上的吸附性质。结果表明 ,H2 的化学吸附等温线与CO有所不同 ,在较高温度下可能存在H2 的溢流。CO为非解离吸附 ,H2 是解离吸附。CO的吸附热低于H2 的吸附热 ,催化剂对CO的活化比H2 困难。CO和H2 在失活的催化剂上化学吸附量显著减小。失活催化剂的总表面积、铜的表面积以及ZnO的表面积也减小。通过对CO和H2 在Cu ZnO基催化剂上的吸附性质的研究 ,不但可用来帮助探讨CO加氢反应机理 ,而且可为了解催化剂表面各组分的分布情况、预测催化剂的活性以及研究造成催化剂失活的原因提供证据。
The adsorption properties of CO and H2 on Cu ZnO-based catalysts were studied. The results show that the chemisorption isotherm of H2 differs from that of CO, and there may be an overflow of H2 at higher temperatures. CO is non-dissociative adsorption, H2 is dissociative adsorption. The adsorption heat of CO is lower than the adsorption heat of H2, and the activation of CO by CO is more difficult than that of H2. The CO and H2 chemisorption on the deactivated catalyst was significantly reduced. The total surface area of the deactivated catalyst, the surface area of copper and the surface area of ZnO are also reduced. By studying the adsorption properties of CO and H2 on Cu ZnO-based catalysts, it can not only be used to explore the CO hydrogenation reaction mechanism, but also to predict the distribution of each component on the catalyst surface, to predict the activity of the catalyst and to study the effects of catalyst loss The reason for living provides evidence.