An experimental adsorbent screening study for CO2 removal from N2

The selection of a suitable adsorbent for CO2 removal from flue gas (mixture of CO2 and N-2) has been carried out. The limiting heats of adsorption, and Henry's Law constants for CO2 with a N-2 carrier, were determined for a group of 13 zeolite based adsorbents, including 5A.. 13X, NaY, NaY-10, H-Y-5, H-Y-30, H-Y-80, HiSiv 1000, H-ZSM-5-30, H-ZSM-5-50, H-ZSM-5-80, H-ZSM-5-280. and HiSiv 3000. The CO2 pure component adsorption isotherms and expected working capacity curves for pressure swing adsorption (PSA) application were determined for a selected promising subgroup of these adsorbents. The results show that the most promising adsorbent characteristics are a near linear CO2 isotherm and a low SiO2/Al2O3 ratio with cations in the zeolite structure which exhibit strong electrostatic interactions with carbon dioxide. (C) 2004 Elsevier Inc. All rights reserved.