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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >CO Oxidation on a CeO_x/Pt(111) Inverse Model Catalyst Surface: Catalytic Promotion and Tuning of Kinetic Phase Diagrams
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CO Oxidation on a CeO_x/Pt(111) Inverse Model Catalyst Surface: Catalytic Promotion and Tuning of Kinetic Phase Diagrams

机译：CeO_x / Pt（111）逆模型催化剂表面上的CO氧化：催化促进和动力学相图的调整

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Nanosized 2D ceria islands randomly distributed over the Pt(111) surface have been prepared by oxidation of the nucleating Ce submonolayer and characterized using XPS and STM for coverages of 0.3 and 0.7 ML. Catalytic CO oxidation over the resulting, well-defined CeO_xPt(111) model catalytic system of the inverse supported catalyst" type has been studied using the UHV chamber as a flow reactor. The CO2 production rate was monitored mass spectrometrically in the temperature range of 413 to 553 K at variable CO/O2 compositions in the 10~(-5) mbar pressure range. The behavior of the present CeO_x/Pt(111) system m the CO oxidation reaction is summarized in kinetic phase diagrams separating regions of high and low reactivity (both monostable) and that of bistability. A significantly enhanced reactivity and a remarkable shift of the bistable region of the reaction toward higher CO pressures were observed when compared to a clean Pt(111) surface. An active border" concept is proposed to explain the strong local enhancement of catalytic activity.
机译：通过氧化成核的Ce亚单层膜制备了随机分布在Pt（111）表面的纳米级二维氧化铈岛，并使用XPS和STM对0.3和0.7 ML的覆盖率进行了表征。使用特高压室作为流动反应器，研究了所得的定义明确的逆负载型CeO_xPt（111）模型催化体系上的催化CO氧化。在413温度范围内用质谱法监测CO2的产生速率在10〜（-5）mbar压力范围内，CO / O2组成变化至553 K.现有的CeO_x / Pt（111）系统在CO氧化反应中的行为总结在分离高，低区的动力学相图中。与纯Pt（111）表面相比，观察到反应性（均是单稳态）和双稳性。观察到反应性显着提高，反应的双稳态区域向较高的CO压力明显转移。提出了“主动边界”概念解释了催化活性的局部增强。

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