Relationship Between Electronegativity of the Extra-Framework Cations and Adsorption Capacity for CO₂ Gas on Mordenite Framework.

ABSTRACT: Synthetic mordenite is widely used as a molecular sieve, adsorbent, and catalyst. To enhance these functionalities, it is crucial to understand the ion-exchange properties and cation-exchange sites of the zeolite. In this study, we analyzed the structural changes in fully Cs-, Sr-, Cd-, and Pb-exchanged mordenite by using synchrotron X-ray powder diffraction under ambient conditions. Rietveld structure refinement revealed that the Cs⁺ cation is predominantly located near the 8-membered ring (8MR) due to its low electronegativity and hydration energy. In contrast, divalent cations such as Sr²⁺ and Cd²⁺ cations, with higher hydration energies compared to monovalent cations, are present as hydrated ions at the center of the 12-membered ring along the c-

SUBMITTER: Lee S 

PROVIDER: S-EPMC11752500 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature