A study on natural clinoptilolite for CO<sub>2</sub>/N<sub>2</sub> gas separation

<p>Based on its low cost and low water adsorption capacity, compared to synthetic zeolites (A-type, X-type and Y-type), natural, untreated clinoptilolite was examined as a potential adsorbent for a separation process targeting on removal of CO<sub>2</sub> from flue gas. Taking into consideration typical flue gas composition and temperature, adsorptive properties of binary CO<sub>2</sub>/N<sub>2</sub> mixtures were tested in the temperature range of 268 to 403 K and compared with literature data. The results showed that CO<sub>2</sub> concentration, total pressure, and temperature strongly affect selectivity and working capacity, restricting the conditions under which the material could be used as an efficient adsorbent.</p>