Abstract
Adsorptive properties of synthetic siliceous mordenites, of large-port type, were investigated as a function of aluminum content and it was found that there were 2.8 ± 0.2 sodium cations per unit cell on the wall of the main channel in the stoichiometric mordenite (Na 8 Al 8 Si 40 O 96 ) and that the number of aluminums on T1 sites decreased with increasing Si/Al ratio. X-ray structural analysis had shown that Al's occupied T3 and T4 sites with high occupancy factors, as far as natural mordenite was concerned, 29 Si MAS NMR data indicated that the distribution of Al's in the synthetic ones considerably differed from the above. Possible distributions of Al and Si orderings in the synthetic mordenites were deduced on the basis of adsorption and 29 Si NMR data.
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