In the present contribution we present an overview of our recent studies using the “kinetics by imaging” approach for CO oxidation on heterogeneous model systems. The method is based on the correlation of the PEEM image intensity with catalytic activity: scaled down to the μm-sized surface regions, such correlation allows simultaneous local kinetic measurements on differently oriented individual domains of a polycrystalline metal-foil, including the construction of local kinetic phase diagrams. This allows spatially- and component-resolved kinetic studies and, e.g., a direct comparison of inherent catalytic properties of Pt(hkl)- and Pd(hkl)-domains or supported μm-sized Pd-powder agglomerates, studies of the local catalytic ignition and the role of defects and grain boundaries in the local reaction kinetics.

中文翻译：

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通过成像获得局部反应动力学

在目前的贡献中，我们概述了我们最近使用“成像动力学”方法在异质模型系统上进行 CO 氧化的研究。该方法基于 PEEM 图像强度与催化活性的相关性：缩小到微米尺寸的表面区域，这种相关性允许对多晶金属箔的不同取向的单个域进行同时的局部动力学测量，包括局部的构建动力学相图。这允许空间和组分解析动力学研究，例如，直接比较 Pt(hkl)-和 Pd(hkl)-域或支持的 μm 大小的 Pd 粉末团聚体的固有催化性能，局部催化点火研究以及缺陷和晶界在局部反应动力学中的作用。