Abstract
Alkali cation exchange on three hydrous ceria samples heated at different temperatures was studied. The decrease of pore size seems to result in a general increase of the magnitude of selectivity, provided that this decrease does not involve the formation of relatively very fores (inaccessible to nitrogen). Exchange in these pores is probably behind the high selectivity to sodium over the other alkali metal ions. A particular selectivity behaviour due to a profound decrease of pore size is probably due to a formation of cavities of proper dimensions for a certain ion, ion exclusion, or a basic dehydration (involving probably primary hydration shells) of counter ions.
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