多晶铑表面上碳氧共存体系的研究

用紫外光电子能谱（ＵＰＳ）和俄歇电子能谱（ＡＥＳ）对碳氧共存的多晶铑表面及ＣＯ、Ｏ_２、Ｃ_２Ｈ_４在该表面上的吸附进行了研究，发现铑表面上共存的表面碳和表面氧存在相互作用，由于表面氧的存在，外来吸附物如ＣＯ、Ｏ_２、Ｃ_２Ｈ_４等可以覆盖在表面碳上面，使表面碳占据表面位抑制其它物种吸附的屏蔽效应消失。该表面具有氧化性，可以把吸附的乙烯氧化。

Study of Coexistence of Carbon and Oxygen on Ploycrystalline Rhodium Surface

Coexisted carbon and oxygen on polycrystalline rhodium surface and CO,O_2,ethylene adsorbed on it had been studied by ultraviolet photoelectron spectroscopy(UPS)and Auger electron spectroscopy(AES).It was found that there was interaction of carbon and oxygen coexisted on rhodium surface. Because of surface oxygen,adsorbates, such as CO,O_2,.ethylene could be adsorbed on the site occupied by carbon,and surface carbon could not block the adsorption site as the surface was modified only by carbon. Adsorption of O_2 resulted surface carbon decrease.Adsorption of CO made the surface oxygen increase but the surface carbon content invariant.When surface carbon content C/ Rh<0.05,ethylene adsorbed on both of carbon site and rhodium site. When surface carbon content C/Rh>0.05,ethylene adsorbed only on carbon site. Carbon and oxygen coexisted on rhodium surface had oxidation,it could oxidize the adsorbed ethylene.