The main technical conditions for synthesizing 4A zeolite with kaolin were determined. The whiteness and calcium ion exchange capacity (CIEC) of the product were increased by calcining and screening the colouring ions...The main technical conditions for synthesizing 4A zeolite with kaolin were determined. The whiteness and calcium ion exchange capacity (CIEC) of the product were increased by calcining and screening the colouring ions, and the high quality 4A zeolite was synthesized successfully. Moreover, the formation mechanism of zeolite also discussed.展开更多
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 an...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.展开更多
文摘The main technical conditions for synthesizing 4A zeolite with kaolin were determined. The whiteness and calcium ion exchange capacity (CIEC) of the product were increased by calcining and screening the colouring ions, and the high quality 4A zeolite was synthesized successfully. Moreover, the formation mechanism of zeolite also discussed.
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)
文摘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.
