Abstract
Zeolites containing cation-exchanged transition metal cations are effective catalysts for a variety of reactions. The distribution of metal cations amongst different cation-exchange sites depends on a variety of factors including, the charge on the cation, the Si/Al ratio of the zeolite, and the distribution of Al atoms in the zeolite framework. An overview is presented of recent theoretical efforts aimed at determining the distribution of charge- exchange sites in ZSM-5 as a function of Si/Al ratio and the stability of mono- and divalent cations located at specific charge-exchange sites. Stability is defined with reference to either reduction to metallic particles or demetallation to form metal oxide particles. The siting requirements and stability of binuclear cations, viz. [M-O-M]2+, are also examined.
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Bell, A.T. (2001). Siting and Stability of Metal Cations in Zeolites. In: Centi, G., Wichterlová, B., Bell, A.T. (eds) Catalysis by Unique Metal Ion Structures in Solid Matrices. NATO Science Series, vol 13. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0782-5_4
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DOI: https://doi.org/10.1007/978-94-010-0782-5_4
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