Green synthesis strategy of chabazite membrane and its CO2/N2 separation performance

Abstract

In this study, non-poisonous and eco-friendly raw chemicals were employed to synthesize a chabazite membrane by seed-induced secondary growth method. With an assistance of porous alumina ceramics support, the prepared membrane was utilized for excellent CO2/N2 separation. The results of structural and morphological characterization of the synthetic chabazite membrane signify that a dense and consistent membrane layer of chabazite was successfully formed on the surface of the alumina ceramic support. The single-component gas permeation experiment was carried out on the synthetic chabazite membrane, and the results showed that the calculated ideal CO2 and N2 separation coefficient reached 3.5. Whereas, the separation experiment of the mixed components showed the CO2 and N2 separation coefficient of 4.05 which might be due to the competition of diffusion between the mixed gas molecules and the selective adsorption characteristics of chabazite. At last, the separation stability experiments results show that the chabazite membrane prepared in this study owns excellent cycle stability and excellent separation performance. This demonstrates that chabazite membrane is an outstanding potential membrane for the separation of CO2 in industrial flue gas.