ABSTRACT
Deuterium NMR relaxation experiments, low temperature deuterium NMR lineshape analysis, and FTIR spectra are consistent with a new model for solid state jump dynamics of water in (2)H(2)O-synthesized kanemite and (2)H(2)O-hydrated Na(+)-Zeolite A. Exchange occurs between two populations of water: one in which water molecules are directly coordinated to sodium ions and experience C(2) symmetry jumps of their OH bonds, and a population of interstitial water molecules outside the sodium ion coordination sphere that experience tetrahedral jumps of their OH bonds. For both samples the C(2) jump rate is much faster than the tetrahedral jump rate. (2)H NMR relaxation experiments match well with the fast exchange regime of the model over a wide range of temperatures, including room temperature and above. For hydrated Zeolite A, the kinetic activation parameters for the tetrahedral and C(2) symmetry jumps are Delta H tet++=+17 kJ/mol, Delta S tet++=-109 J/(mol K), Delta H C2++=+19 kJ/mol, and Delta S C2++=-20 J/(mol K). For kanemite, Delta H tet++ =+23 kJ/mol, Delta S tet++=-69 J/(mol K), Delta H C2++ =+23 kJ/mol, and Delta S C2++ =-11 J/(mol K).
Subject(s)
Deuterium/chemistry , Models, Chemical , Silicates/chemistry , Sodium/chemistry , Water/chemistry , Zeolites/chemistry , Computer Simulation , Diffusion , MotionABSTRACT
2H NMR was used to study the nature of deuterated water in kanemite. Evidence is presented that shows that the water changes state from liquid to solid at room temperature during the hydration reaction that forms kanemite. The deuterium nuclei in the water experience rapid tetrahedral jumps in a hydrogen-bonded lattice like those observed in 2H2O ice.
