Synthesis,structural characterization and some properties of a germanic analogue of phillipsite

Germanic phillipsite, with the chemical formula K₂O·Al₂O₃·2GeO₂·xH₂O, has been synthesized at 90°C from K⁺ containing gels. The parameters of its primitive (tetragonal) unit cell are : $\text{a}\text{=}\text{b}\text{= 14.515}\text{A}\text{?}$ and $\text{c}\text{= 9.733}\text{A}\text{?}$. IR spectroscopy shows that all the absorption bands are shifted towards longer wavelengths. The structural stability towards ion-exchange has been followed by X-ray diffraction. Adsorption isotherms of N₂ and H₂O have been measured. The pore opening of K-germanic phillipsite is approximately 3 Å.