23Na NMR study of the mechanism for the dehydration of zeolite NaA

Conclusions Water molecules in partially dehydrated zeolite directly interact with Na⁺ cations. The final three or four water molecules per unit cell removed upon the dehydration of zeolite are apparently bound to Na⁺ cations of the eight-membered windows, while the previous 10 molecules are bound to Na⁺ cations of six-membered windows.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 5, pp. 1160–1162, May, 1988.