摘要
Dielectric spectra of 4A zeolite particles bulked in deionized water(4A/W) or cyclohexane(4A/C) were measured respectively under different temperatures, and two dielectric relaxations were found in both of 4A/W and 4A/C. Because of existence of water molecules in pores, both low and high frequency relaxation times(t LFR and t HFR) of 4A/W decreased more sharply than 4A/C with increasing temperature.According to the temperature dependence of t LFR and t HFR, the activation energies of Na+interacting with framework under hydrated and dehydrated environments were calculated respectively, and the original properties of Na+in dehydrated zeolite were obtained by analyzing the dielectric properties of 4A/C.Furthermore, a transient state of Na+motion with temperature was found in 4A/C system.
Dielectric spectra of 4A zeolite particles bulked in deionized water(4A/W) or cyclohexane(4A/C) were measured respectively under different temperatures, and two dielectric relaxations were found in both of 4A/W and 4A/C. Because of existence of water molecules in pores, both low and high frequency relaxation times(t LFR and t HFR) of 4A/W decreased more sharply than 4A/C with increasing temperature.According to the temperature dependence of t LFR and t HFR, the activation energies of Na+interacting with framework under hydrated and dehydrated environments were calculated respectively, and the original properties of Na+in dehydrated zeolite were obtained by analyzing the dielectric properties of 4A/C.Furthermore, a transient state of Na+motion with temperature was found in 4A/C system.
基金
supported by Beijing Natural Science Foundation (Nos. 2143040, 2144047)
the Importation and Development of High-Caliber Talents Project of Beijing Municipal Institutions (No. CIT&TCD201504009)
National Natural Science Foundation of China (No. 21301012)