The selectivity and efficiency of catalytic reactions in zeolites are mostly determined by the dynamics of the guest molecules because the latter is not only responsible for the mobility of the guest molecules within the lattice itself but also for the translational mobility to the active centers. In faujasites of type NaX and NaY the sodium ions were partly exchanged by metal ions (Pt2+, Pd2+, Ag+, Ni2+, Zn2+, Mn2+) in an aequous ion exchange procedure, and the zeolite was loaded with benzene. Compared to the ÁSR spectra of pure benzene the spectra of the metal exchanged zeolites show shifts of the resonance positions.
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