Reaction intermediates in the heterogeneous catalysis of metal clusters studied by using a novel method of coherent anti-Stokes Raman scattering (CARS)

金属簇合物的催化作用在许多化学领域以及工业应用中都有着重要的作用。对于新型催化剂的设计和催化行为的预测，对反应路径的准确了解是非常重要的。相干反斯托克斯拉曼散射(CARS)显微镜是一种非常强大的技术，被广泛应用于生物系统的分析，如活细胞。由于空间分辨率和化学敏感性的结合，这项技术通常非常适合于研究非均质体系。由于这种技术具有高灵敏度、高时间分辨率和高光谱分辨率，通过使用新型的多路CARS，将获得对金属粒子催化的新的有价值的见解。作为一种典型的模型反应，铂和钯粒子催化的CO氧化反应将在“真实”条件下进行，并取决于粒子的团簇大小、底物和反应条件(例如：反应温度或反应气体的湿度)。

Catalysis on metal cluster plays an important role in several fields of chemistry as well as in industrial applications. For designing new catalysts and predicting their catalytic behavior, the exact knowledge of reaction pathways is of main importance. Coherent anti-Stokes Raman scattering (CARS) microscopy is a very powerful technique that is intensively used in the analysis of biological systems such as living cells. Due to the combination of spatial resolution as well as chemical sensitivity, this technique is generally very well suited for studying heterogeneous systems. By using a novel version of multiplex CARS new valuable insights into the catalysis of metal particles will be obtained, since this technique supplies high sensitivity, high time resolution, and high spectral resolution. As a typical model reaction CO oxidation catalyzed by platinum and palladium particles will be investigated under “real” conditions, and studied depending on cluster size of the particles, the substrate, and reaction conditions (e.g.: reaction temperature or humidity of the reaction gases).