Thermodynamic and Kinetic Desorption Analysis on Direct Air Capture of CO2 Gas Using Moisture Swing Sorbent

Abstract

An anion exchangeable resin sorbent originated from amine was used to capture & absorb CO2 from atmospheric air. The sorbent is capable to absorb CO2 gas in dry location, though it releases CO2 gas when it is exposed to water vapor or liquid water. The isotherm test on absorption provides the evidence that the sorbent can act effectively at the very low concentration of CO2. Its capacity of absorption in the form of carbonate ion is 0.86 mol/kg, which is identical to nearing of 21 liter of CO2 gas under 100 kPa & 25⁰C. Langmuir equation detailed the absorption isotherm better at higher saturation. The kinetic desorption of CO2 spread over in a flat polypropylene sheet has been practiced by the well developed models & experiments. After that, the desorption coefficient, kinetic desorption parameters & stimulated energy are estimated with that equation & model. Finally more experiments should be developed to find out the exact reaction mechanism on this method with accumulating new information.