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原子尺度上的异质催化

Heterogeneous catalysis on an atomic scale

  • 摘要: 现实中的催化剂是个相当复杂的系统体系,且为粉末状,限制了多种表面科学表征手段的应用.科学家通过建立简化的催化剂模型,充分利用目前多种有力的科技分析手段,如扫描隧道显微镜(STM)、透射电镜(TEM)、光电子能谱(XPS)、傅里叶变换红外吸收谱(FTIR)、电子能量损失谱(EELS)等,直观地在原子尺度上研究催化反应的机理,从而使得人们能够设计出选择性能更高、催化性能更好的催化剂.

     

    Abstract: A basic understanding of the relationship between structure and reactivity is needed for a targeted catalyst development scheme. Due to the complexity of real heterogeneous catalysts it is imperative to simplify the problem in a way such that an essential part of the complexity is included, while allowing one to investigate the catalyst system at the atomic level. Two models have been used, one is a metal single crystal in ultra-high vacuum conditions, and the other is metal clusters supported on planar oxide films under the same and also ambient conditions.

     

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