Abstract
When sodium zeolites X and Y with a wide range of silica to alumina ratios were ion-exchanged with rare earth ions by a standardized procedure, the degree of exchange was found to depend strongly on the SiO 2 Al 2O 3 ratio. The plots of the equivalents of RE 3+ Al , Na + Al , the number of rare earth ions per unit cell or the number of sodium ions per unit cell as a function of the aluminum content of the unit cell show discontinuities that coincide with those observed in the correlation between the lattice parameter and the number of Al per unit cell.
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