Ultra-thin Zeolite Films: A New Generation of Model Catalysts

沸石粉末多年来一直被用作工业催化剂。这些材料的结构类似于家用海绵，即沸石是含有贯穿其内部区域的气孔的固体。然而，与海绵不同的是，沸石中的孔是均匀的，单个沸石样品只有一个孔径。这些材料中的孔隙通常是小分子的大小，例如水。因此，沸石能够起到分子筛的作用，并可用于分离不同大小的分子。沸石的这种性质是因为它们能够有效地将分子反应物转化为有用的产品，如石油重整，以增加其运输能量输出。为了进一步开发和改进沸石的性能，有必要充分了解发生在孔内的化学过程。然而，这很难系统地研究，因为沸石粉末不适合进行详细的分析。因此，将分子水平上的沸石颗粒分散到固体表面上，就可以形成超薄光滑的沸石薄膜。这种结构和大小的薄膜适合在真空中用强大的电子分析方法进行详细的研究。这将大大提高我们对沸石化学的理解。

Zeolites powders have been used for many years as industrial catalysts. The structure of these materials resembles that of a domestic sponge i.e. zeolites are solids that contain pores extending throughout their interior regions. However, unlike a sponge, the pores in zeolites are uniform, where a single pore diameter exists for an individual zeolite sample. The pores in these materials are typically the size of a small molecule e.g. water. As a result, zeolites are capable of acting as molecular sieves and can be used to separate molecules of different sizes. This property of zeolites is responsible for their ability to efficiently transform molecular reactants to useful products e.g. reforming of petroleum to increase its energy output for transportation.In order to further develop and improve the performance of zeolites, it is necessary that the chemical processes occurring within the pores are fully understood. However, this is very difficult to study in a systematic manner since zeolite powders are not suitable for a detailed analysis. Therefore, an ultra-thin smooth zeolite film will be formed by dispersing zeolite particles at the molecular level onto a solid surface. A film of this structure and magnitude is appropriate for a detailed study in vacuum using powerful electronic analysis methods. This will significantly improve our understanding of zeolite chemistry.