Measuring the direct air capture performance of adsorbents by vacuum volumetric gas adsorption
A common chemisorptive carbon capture material, Lewatit VP OC 1065, was studied for determining surface area, H2O and CO2 uptake, heat of adsorption, and physisorbed and chemisorbed CO2 binding sites.
Direct air capture (DAC) has become a central topic in modern materials science - from research to commercial implementation. Removing CO2 from the atmosphere is a decades-old concept, commercially implemented as H2O-amine based liquid absorbents in the 20th century. Currently, the DAC industry is exploring physical adsorbents rather than the liquid absorbents used for point source CO2 capture. This report documents a set of adsorption experiments (gas and vapor) as a bare minimum for physicochemical characterization using vacuum volumetric gas adsorption. Additionally, the concept of static volumetric chemisorption is introduced to provide another avenue for a nondestructive active site characterization for CO2 chemisorbents to complement their characterization by flow chemisorption (pulse titration) techniques.
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