| 초록 |
Recently, zeolite has drawn much attention because of exceptional CO2 adsorption capacity. SSZ-13, high siliceous CHA type zeolite analog has been reported to show unusual CO2 adsorption capacity. Further aluminosilicate CHA zeolite of low Si/Al ~ 2.3 showed much stronger CO2 adsorption more than on SSZ-13 that the corresponding CO2 adsorption isotherm was belong to the type I Langmuir isotherm. However, for reversible carbon dioxide storage, the adsorbed CO2 onto zeolite has to be removed with a little energy consumption. In the present work, we have investigated the effect of the cation exchange into zeolite on the adsorption isotherm using dual site adsorption model for the analysis of CO2 adsorption isotherm as a function of temperature. The result showed that the resulting isotherm after the ion exchange contained both strong and weak adsorption characteristics depending on the exchanged cation and the portion of the weak adsorption could be increased with simple ion exchange. |
