CO Adsorption on Cation Exchaged Zeolite A and Mordenite

The adsorption properties of CO on the cation exchanged natural zeolite, and cation effects upon the CO adsorption were studied. exhibited relatively good CO adsorption capacities and treated by 0.4 N- solution proved itself as the best adsorbent and superior to the synthetic zeolite 4A and 5A. The observed adsorption tendency due to the cations were in the order of $Ba^{2+}>Cu^{2+}>Na^+>K^+>Mg^{2+}>Ca^{2+}$. The cation exchanged number per unit cell as well as the kind of cation which forms bond with CO molecules in different intensities and other mineral factors such as pore size indicated to be important factors to the CO adsorption properties. The CNDO/2 calculations were performed to compare the adsorption tendencies and CO interaction energy of cations in .