INVESTIGATION OF PHASE PURITY OF FAUJASITE-TYPE Y ZEOLITE

Phase purity of Y zeolite has been studied by X-ray powder diffraction analysis and by measurement of equilibrium adsorption capacity. X-ray powder pattern of Y zeolite does not comprise the diffraction with d422 = 0.5 nm, reported by previous authors. Pure Y and KS01 zeolite were prepared, and it was shown that the occurrence of the above-mentioned diffraction is due to the presence of KS01 zeolite in the investigated samples. Heating the KS01 zeolite to 300, 400, 500, and 650°C leads to amorphization of the structure with gradual loss of adsorption capacity, while the crystal structure and adsorption capacity of the Y zeolite remains preserved. Both methods have been used for identification of KS01 admixture in Y zeolite. © 1990.