Gas-Phase-Mediated Processes Related to SSIE

Introduction of Cations into Zeolites Through a Vapor Phase Containing the In-Going Species 

Effect of Additional Molecuies in the Vapor Phase on 55IE at Elevated Temperatures 

In the presence of carbon monoxide, CO, metals such as Mo, Re or Ru frequently form carbonyls, which subsequently may be encaged in zeolites and, after decomposition, transformed into small metal aggregates. However, in several cases, the encapsulated carbonyls are transferred into cationic species and anchored as such in the zeolite matrix. For example, Co2(CO)g was oxidized by the protons of H-Y to Co + and held at sites in the supercages, as suggested by IR investigations [251]. Formation of the cations may be due to a reaction as described by Eq. (23). 

These dicarbonyl species were able to migrate into the zeohtic pores and react there with acidic OH groups, as evidenced by FUR. Thus, stable Rh(CO)J were finally formed on cation positions  

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