Abstract
Natural Itaya and Nakano zeolites were treated with hydrochloric acid for 1hr at 100°C. The original zeolites and the treated ones were characterized by X-ray diffraction, chemical analysis, thermo-gravimetric analysis and adsorption. The X-ray diffraction patterns of the zeolite treated with 1mol·dm-3 acid and those of the untreated zeolite were almost identical, but the ratio of SiO2 to Al2O3 was different. The zeolite treated with acid rapidly increased its inner adsorption volume. The monolayer capacity of nitrogen gas rapidly increased as the amount of cations in the zeolite decreased.
The effect of hydrochloric acid treatment on gas separation properties of natural Itaya and Nakano zeolites was investigated. Hydrogen, oxygen, nitrogen, methane and carbon monoxide were completely separated on the acid treated Itaya zeolite column, but not on the natural Nakano or its acid treated zeolite column.
