板谷ゼオライトおよびその改質物の物理化学的性質と気体の吸着分離特性

概要

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Itaya natural zeolite and its cation-treated zeolite were characterized by X-ray diffraction,thermogavimetric analysis,adsorption and chemical analysis. No change of X-ray diffraction pattern was found for Itaya zeolites treated with 1 mol・dm^<-3> hydrochloric acid but a slight change of SiO_2/Al_2O_3 ratio was found. The surface of Itaya zeolite seem to contain both meso- or macropores,but its heterogeneous surface became homogeneous with hydrochloric acid treatment,being predominantly composed of micropores.The monolayer adsorption capacity of zeolite for nitrogen gas deceased as the amount of cations in the Itaya zeolite increased.The cation (Na^+,NH^+_4,Ca^<2+> exchanged Itaya zeolite samples had leee nitrogen adsorbing power tsan the hydrochloric asid-treated zeolite.the gas separation behaviour of Itaya zeolite was compared with that of the cation-treatedzeolite.Separation of hydrogen, oxygen, nitrogen, methane and carbon monoxide from the surface of zeolites was investigated at 30〜100℃ by using Itaya zeolite and its cation-treated zeolite as column packings. Hydrogen, oxygen, nitrogen, carbon monoxide and methane were found to be separatablecompletely from the mixture gases by using Itaya zeolite, hydrochloric acid treated zeolite and its K^+ exchange zeolites.Amethane-oxygen mixture could not be separated by Na^+,NH^+_4 and Ca^<2+> exchanged Itaya zeolites.
社団法人日本材料学会の論文
1990-07-15