NMR Studies of 7Li, 23Na, and 27Al in Y-Faujasite

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Abstract
NMR methods were used to study specific atom environment and distribution in Y‐faujasite. The widths of the 27Al and 23Na signal in the hydrate were dominated by second‐order quadrupolar effects; they were not observable in the dehydrated material. The exchange of lithium for sodium and the subsequent observation of the 7Li NMR in the dehydrated Y‐faujasite provided a convenient structural probe and permitted a comparison of the experimental and theoretical second moments, the latter being based upon the cation distribution known for the sodium form from x‐ray diffraction data. Magnetic dipolar broadening dominates the linebreadth of the 7Li resonance.