Abstract
Na-A type zeolite (Na-A) shows favorable selectivity for nitrogen in an oxygen-nitrogen bi-component system at room temperature and also it is known that oxygen selectivity is dominated by differences in adsorption rates. In this study, the oxygen adsorption behavior of Na-A pellets at low temperature was evaluated. When temperature decreased, oxygen selectivity was enhanced as a result of the difference in adsorption rates. It was also strongly suggested that the oxygen equilibrium adsorbed amount of Na-A pellets was larger than that of nitrogen below 213 K. Na-A pellets are expected to be a good oxygen adsorbent for oxygen-nitrogen separation from air by pressure swing adsorption (PSA).
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