Preparation Approaches to Metal Clusters

Generally two approaches can be used to prepare metal clusters in zeolites. One involves direct evaporation and deposition of metals into the pores of zeolites, whereas the other is to load the metal-containing precursors into the zeolite pores followed by formation of metal clusters in the zeolite pores through decomposition or reduction.[3] According to the preparation techniques used, these two approaches can be further divided into the following sub-approaches  

For metals with a relatively high vapor pressure, it is possible to load the metal clusters into the zeolite pores through direct evaporation. Rabo et al. first reported the preparation 

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