Activation and Reactions of CO2 on a K-Promoted Au(111) Surface

Arnold Peter Farkas; Frigyes Solymosi

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Activation and Reactions of CO2 on a K-Promoted Au(111) Surface

机译：K促进的Au（111）表面上CO2的活化和反应

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The adsorption of potassium and CO2 and their interaction on a Au(111) surface have been studied using high-resolution electron energy loss spectroscopy, thermal desorption spectroscopy, work function measurements, and Auger electron spectroscopy. Potassium adsorbs in cationic form on Au(111) at low coverage, depolarizing to a neutral metallic state at high coverage. CO2 adsorbs only weakly on clean Au(111), desorbing with a T_p ~ 124 K. Its binding energy is greatly enhanced by the presence of potassium and led to the formation of a CO2~- anion radical characterized by losses at 957, 1360, and 1620 cm~(-1). An enhancement of a weakly held, unperturbed CO2 also occurred on a K-dosed surface, which was attributed to the formation of an unstable cluster compound (CO2)_n·CO2~-. The surface concentration and the reactivity of the CO2~ radical sensitively depend on the K coverage and on the state of potassium. At low K coverages, CO2~ dissociated into CO_(a) and O_(a)~-. At higher coverages, it disproportionated into stable CO_3~- (a) and CO_(a)~-; they decomposed and released only above 500 K. CO formed on a K-dosed surface gave vibration losses at 1940-1700 cm~(-1) and was also stabilized by potassium.

机译：钾和CO 2的吸附及其在Au（111）表面上的相互作用已使用高分辨率电子能量损失谱，热解吸谱，功函数测量和俄歇电子谱进行了研究。低覆盖率下钾以阳离子形式吸附在Au（111）上，高覆盖率下极化为中性金属态。二氧化碳仅在清洁的Au（111）上微弱地吸附，在T_p〜124 K时解吸。由于钾的存在，其结合能大大增强，并导致形成了一个二氧化碳离子自由基，其特征在于957、1360，和1620 cm〜（-1）。在K剂量的表面上也发生了弱保持的，不受干扰的CO2的增加，这归因于不稳定簇化合物（CO2）_n·CO2-的形成。 CO 2-自由基的表面浓度和反应性敏感地取决于K的覆盖率和钾的状态。在低K覆盖率下，CO2〜分解为CO_（a）和O_（a）〜-。在较高的覆盖率下，它分成稳定的CO_3〜-（a）和CO_（a）〜-;它们分解并仅在500 K以上释放。在K剂量表面上形成的CO在1940-1700 cm〜（-1）处产生振动损失，并且还被钾稳定。

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《The journal of physical chemistry, C. Nanomaterials and interfaces》 |2009年第46期|共7页
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Arnold Peter Farkas; Frigyes Solymosi;
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中图分类物理化学（理论化学）、化学物理学;
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Activation and Reactions of CO2 on a K-Promoted Au(111) Surface

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