Localization of Water Molecules and Sodium Ions in Na-Mordenite, by Thermally Stimulated Current Measurement

摘要: Dielectric relaxation properties of dehydrated and hydrated Na-mordenite are measured by means thermally stimulated depolarization current (TSDC) spectroscopy. TSDC spectroscopy allows us to determine two characteristic terms which depend on the hydration state: one hand, site selectivity sodium ions water molecules other sodium/network interaction energy. Upon hydration, half Na+ remain embedded in A, whereas extracted from main channel sites (sites D E). Besides, according content, we show that adsorbed different sites, first H or F, then B, C, G, finally G. Furthermore, it is pointed out energy (Na+/zeolite) value depends localization following sequence: Esite A > E. Finally, shown decreases as content increases (typically 0.79 eV 0.44 eV). Thi...