Promoted Direct Air Capture of Carbon Dioxide by Synergistic Water Harvesting

Abstract

Adsorption-based direct air capture (DAC) of carbon dioxide has been widely recognized as a necessary measure to contain atmospheric CO2 concentrations. Chemisorbents like solid amines are effective in capturing ppm level CO2. However, because of the large heat of adsorption, the regeneration of solid amines requires high energy consumption and a significant driving force, compromising the economic viability and productivity of DAC. A vapor-promoted desorption (VPD) process was developed to recover the CO2 adsorbed on solid amines by in situ vapor purge using water harvested from the atmosphere synergistically. A double-layered adsorption configuration, sequentially packed with solid amines..