Patents

The invention relates to a process for the preparation and use of of Pentasil type zeolite molecular sieves for the selective adsorption of carbon dioxide from a gaseous mixture containing carbon dioxide in the range of 3 to 20% by volume as in the case of power plant flue gas. Particularly, the invention relates to the use of pentasil type zeolites comprising of mordenite, zeolite beta and ZSM-5, with SiO2/Al2O3 ratio 25-900 at temperature in the range of 293-423K and ambient pressures. The highest equilibrium adsorption capacity for CO2 was 51.5 cc/g and highest breakthrough capacity for CO2 was 25.6 cc/g at 303K at a total feed gas flow of around 120 ml/min in ZSM-5(25) adsorbent pellets.