Selective and Reversible Cation-Gating Adsorption Behavior in Gmelinite Zeolites for Efficient CO₂ Separation.

ABSTRACT: Zeolites exhibiting stepwise adsorption behavior, i.e., a two-step increase in carbon dioxide (CO₂) uptake, have attracted attention in the field of zeolite research due to the potential to recover CO₂ using a small amount of energy. In this study, a Na⁺-type gmelinite (GME) zeolite exhibited stepwise adsorption behavior due to the migration of Na⁺ ions in the GME framework. Gas adsorption measurements, in situ powder X-ray diffraction (PXRD) analysis, and magic-angle spinning (MAS) nuclear magnetic resonance (NMR) analysis revealed that Na⁺ serves as a gate-opening cation that induces the migration of CO₂ from straight channels to the grain-like cages, resulting in notable stepwise adsorption. Remarkably, repetitive CO

SUBMITTER: Higuchi Y 

PROVIDER: S-EPMC12754748 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature