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Co cations were introduced into ZSM5 and faujasite type zeolites by solid state ion exchange. On both types of zeolites the solid state reaction led to an exchange of all protons. On ZSM5 one proton was exchanged with one Co^{2+} cation, while on the faujasite samples two protons were exchanged with one Co^{2+} cation. After the incorporation of cobalt two new Lewis acid sites were observed on the...
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