FTIR SPECTROSCOPIC STUDIES OF METHANE ADSORPTION ON SODIUM AND CESIUMCONTAINING Y-ZEOLITES

Methane adsorption on NaY and cesium containing Y-zeolites has been in vestigated by FTIR spectroscopy. The results indicate an adsorption-in duced symmetry reduction of CH4 from T-d to C-3v. A splitting of the n u(1) mode in NaY can be attributed to the interaction of CH4 with Naions in the different zeolite sites. The location of Cs+ ions in diffe rent crystallographic positions cannot be resolved. In addition to CH4 complexes with alkali cations, an interaction with weakly basic frame work oxygens could also be detected in NaY. In the Cs+-containing Y-ze olite, the corresponding nu(1) mode seems to coincide with that of the Cs+...H-CH3 complex.