水溶液からのモルデナイトの合成およびそのイオン交換体のベンゼン吸着

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Mordenite was synthesized from aqueous clear solutions with composition of sodium aluminosilicates, at 100℃ under atmospheric pressure. The optimum composition of starting materials in the synthesis was 10Na_2O・0.1Al_2O_3・34SiO_2・440H_2O. In unseeded systems, the crystallization of mordenite was characterized by a long induction period, and analcime also crystalized as a minor phase. In seeded systems, mordenite was rapidly formed because the seed surface played a role as the nucleation sites. Such rapid crystallization inhibited the formation of analcime. The exchange of various cations for sodium in synthetic Na form (Na_<6.50>(Al_<6.50> Si_<41.50>O_<96>) ・25.50H_2O) was carried out by the reaction at 25℃ for 60 hrs. The degree of exchange varied with depending on ionic radii and charges of entering cations : in general it was high for univalent cations as compared with divalent and trivalent ones. The experiments of the adsorption of benzene on the ion exchanged forms were performed at 25℃, and their adsorption isotherms corresponded to Langmuir type. The adsorbed amounts of benzene on the exchanged forms varied with depending on the cation species : they were large for H form and alkali metal ion forms, very small for transition metal ion forms, and intermediate for alkaline earth metal ion forms. Especially, the adsorbed quantity for the H form was the largest, and the four molecules of C_6H_6 per the unit cell were occluded, which were maximum from the geometrical configuration in a mordenite cavity. The heat of adsorption of benzene and water on H form was about 5.8 and 10.9 kcal/mol, respectively, at temperatures ranged from 287 to 320°K.
日本粘土学会の論文
1980-06-25

水溶液からのモルデナイトの合成およびそのイオン交換体のベンゼン吸着

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