Selective and Reversible Cation-Gating Adsorption Behavior in Gmelinite Zeolites for Efficient CO 2 Separation
Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide Zeolites exhibiting stepwise adsorption behavior, i.e., a two-step increase in carbon dioxide (CO 2 ) uptake, have attracted attention in the field of zeolite research due to the potential to recover CO 2 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 CO 2 from straight channels to the grain-like cages, resulting in notable stepwise adsorption. Remarkably, repetitive CO 2 adsorption measurements clarified that this stepwise adsorption performance was reversibly induced. Other cation-type GME zeolites such as Li + - and K + -GME zeolites exhibited type-I CO 2 adsorption isotherms, indicating only Na + ions were capable of inducing the cation-gating CO 2 adsorption performance. Furthermore, time-resolved PXRD analysis revealed that the migration rate of Na + was high under the CO 2 adsorption and desorption processes. In addition, stepwise adsorption behavior was observed even when the GME zeolite powder was pelletized. These findings pave the way for the development of highly efficient CO 2 separation processes that rely on zeolites with stepwise adsorption properties.
Authors: Yuto Higuchi, Chihiro Yasuda, Yuna Suetsugu, Satoshi Inagaki, Shunsuke Tanaka
Institutions: Kansai University, Yokohama National University
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
SDG: Climate action
Open Access status: hybrid
Estimated APC paid: $4,500
OpenAlex ID: W4416820797