Abstract
The process of formation of faujasite type zeolite from allophane was studied by X-ray di-ffractiometry. The mixtures having various SiO2/A1203 molar ratios were prepared by adding silica gel to allophane, and these mixtures were heated with NaOH solution under atomospheric pressure. Then, a few kinds of zeolite were prepared. With the increase of the treating time, the A type zeolite was transformed into hydroxy sodalite either through the reaction Ior through the reactionII-III. With the increase of the SiO2/A1303 mo1ar ratio.the reactionII IIItoo: k place instead of the reaction I. Faujasite type zeolite also was transformed into phillipesite type zeolite through the reaction process N with the increase of the SiO2/A120s molar ratio. When the SiO2/A120s molar ratip ef starting mixtures was low, A type zeolite or phillipsite or type zeolite were resulted. But urider the condition that the SiO2/A120s molar ratio was low, the A type zeolite formed was transformed into faujasite type zeolite with the increase of the treating time. The process of the formation of zeolites from allophane could be summarized as follow:
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