Analysis and perspectives concerning CO2 chemisorption on lithium ceramics using thermal analysis

Abstract

CO2 removal from flue gas has been proposed as one of the most reliable solutions to mitigate global greenhouse emissions. Lithium ceramics are among several materials that have potential applications in CO2 removal. Lithium ceramics are able to chemisorb CO2 in a wide temperature range, presenting several interesting properties. All lithium ceramics present a similar CO2 chemisorption reaction mechanism that has been described at the micrometric scale. However, there are several issues that have not been fully elucidated. The aim of this study is to re-analyze different experiments related to the CO2 chemisorption on lithium ceramics and to propose how different factors control this process. This study focuses on diffusion controlled CO2 chemisorption, which has been shown to be the limiting step of the CO2 chemisorption process. Diffusion controlled CO2 chemisorption appears to be mainly influenced by the chemical composition of a product’s external shell.