TG-FTIR Measurement of CO2-H2O co-adsorption for CO2 air capture sorbent screening

AbstractCapturing atmospheric CO2 using solid sorbents is gaining interest. As ambient air normally contains much more (up to 100 times) water than CO2, a selective sorbent is desirable as co-adsorption will most likely occur. In this study, a convenient method based on an TG-FTIR analysis system is developed and used to characterize sorbents for their water and CO2 adsorption capacity when exposed to ambient air. The method allows to determine quantitatively the co-adsorbed amounts of CO2 and water from small sample sizes (10mg range) and is expected to be a useful instrument in sorbent screening and evaluation