Abstract
The paramagnetic effects of oxygen molecules on the sodium cations in zeolite LiNaX (≈70% Li; 30% Na) were investigated using variable-temperature 23Na MAS NMR and 23Na MQMAS NMR. The presence of the oxygen caused a downfield paramagnetic shift for the site III resonance, indicating the accessibility of these cation sites. Although a shift was realized, it is much smaller than what is observed for 7Li by others. To understand these results, 23Na MQMAS NMR was used to calculate the isotropic chemical shifts, quadrupolar shifts, and the quadrupolar coupling constants. The quadrupolar coupling constant and quadrupolar shift of the site III sodium remain the same irrespective of the presence or absence of oxygen; however, these values were affected by temperature changes and were found to increase at lower temperatures.
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