Eco-friendly synthesis of kaolin-based chabazite for CO₂ capture

Abstract

Chabazite was successfully synthesized from Kaolin for the first time via a calcination-hydrothermal process. The effects of Si/Al ratio, (OH)⁻/Si ratio, calcination time and hydrothermal time on the synthesis process were investigated one by one, and the final synthesis scheme under this condition was obtained. The adsorption isotherms of CO₂ and N₂ were measured at 30–90°C and 0–120 kPa to measure the gas adsorption properties of chabazite. In this paper, the adsorption capacity of chabazite to CO₂ and N₂ could reach 1.61 and 0.66 mmol/g respectively at 120 kPa and 30°C. In addition, chabazite showed excellent CO₂/N₂ selectivity over the full pressure range.