In this contribution the catalytic behaviour of the zeolites CsNaX-60 and CsNaX-60 . 8CsOH (impregnated with eight CsOH per unit cell) was studied. As a model reaction, the conversion of isopropanol to acetone as the product of basic catalysis or to propene as the product of acid catalysis was chosen. The intracrystalline self-diffusivities of isopropanol, acetone and propene in these zeolites and in NaX were measured with the pulsed field gradient (PFG) NMR technique. Self-diffusivity measurements of propane and water were performed to characterize these three zeolites. C-13 MAS NMR studies with proton decoupling were used to test the cesium containing zeolites for acid or basic catalytic activity.