Modification of Potassium Chabazites Derived from Fly Ash by Dosing Extra Cations: Promoted CO₂ Adsorption Capacities and Fine‐Tuned Frameworks

Abstract

Potassium chabazite (K-CHA), a typical microporous zeolite with excellent CO 2 separating properties, was synthesized with waste fly ash and modified via cation dosing treatments using cesium and zinc cations, respectively. The resulting CHAs were analyzed by XRF, XRD, FT-IR, SEM, and N 2 physisorption, whose CO 2 adsorption properties were then tested on the reorganized TGA apparatus. It showed from XRF data that cesium and zinc cations were successfully imported in the original K-CHA by cation dosing, but the CHA microstructures and morphologies of K-CHA were perfectly retained as confirmed by XRD, FT-IR, SEM and N 2 physisorption. Since there were still over 9 potassium cations per unit cell in cation dosed Cs-CHA * Prof. T Du