Highly efficient and selective CO2 capture of Li2CO3- and (Li-K)2CO3-based porous carbon composites

Abstract

In this study, Li2CO3- and (Li-K)2CO3-based porous carbon composites were synthesized from terephthalic acid, lithium hydroxide and sodium hydroxide through calcination at different temperatures. These materials were fully characterized through X-ray diffraction, Raman spectroscopy, and nitrogen adsorption and desorption. Results showed that the excellent CO2 capture capacities of LiC-700 °C and LiKC-600 °C were 140 and 82 mg CO2 g−1 at 0 °C and 25 °C, respectively. Additionally, it is calculated that the selectivity of LiC-600 °C and LiKC-700 °C with a CO2/N2 (15 : 85) mixture was about 27.41 and 15.04, respectively. Therefore, Li2CO3- and (Li-K)2CO3-based porous carbon materials could be used to effectively capture CO2 with high capacity and high selectivity.