Ion exchange properties of hydrous zirconia in mix solvents: Thermodynamics of alkali cation exchange in methanolic solutions

Thermodynamics of Alkali Ion Exchange from Methanolic Solutions on Hydrous Stannic Oxide: Excess Thermodynamic Functions of Mixing

“…With regard to the catalytic activity results obtained with b-stannic acid prepared by oxidation of stannic oxide, Harrison and Thornton have made several of tin metal with concentrated HNO 3 ( 17 ) . The present studies on its surface chemistry and interactions with CO, results would add to the previous study of zirconia ( 45 ) CO 2 , NH 3 , and several organic molecules (38, [40][41][42][43].…”

“…thermodynamic study hitherto reported involves Li/Na and Its porous texture was evaluated from a nitrogen adsorptionLi/Cs exchanges from methanolic solutions on hydrous zir-desorption isotherm. The isotherm was type I with no change conia (45). This study has shown that the change in the in adsorption at P/P 0 § about 0.3 and no hysteresis.…”

“…The replace-in solution), and the thermodynamic equilibrium constant ment of Li / by Na / or Cs / was followed in aqueous and (selectivity constant) K a can be written as follows: mixed solvents containing 30 and 60% (w/w) methanol. Concentrations of alcohol higher than 60% were not used since precipitation of the LiOH took place (45). After equi-…”

“…This was taken as evidence that only the relevant ion exchange took place (45). The g activities of 22 Na and 134 Cs K is obtained directly from the ion exchange isotherms, and were determined using a NaI scintillation head connected to g { is the mean molal activity coefficient of the electrolytes a Nuclear Chicago Model 186A scaler.…”

“…Cesium hydroxide The thermodynamics of alkali cation exchange from aque-was prepared by adding cesium sulfate to a calculated ous solutions on hydrous oxides was studied for hydrous amount of barium hydroxide solution. The isotopes used zirconia (44,45), ceria (46), and stannic oxide (b-stannic 22 Na and Cs were supplied by Amersham International, acid) (17). It was shown (17) that stannic oxide has unusual United Kingdom and were employed as tracers to follow the features presumably due to its highly microporous nature.…”