Deep Green

Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/12328

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    Direct air capture via counter‐current NaOH absorption system : evolution of pH for subsequent plasma‐enhanced CO₂ utilization
    (2025) Seithümmer, Valentin Benedikt; Dubiel, Christoph; Kaufmann, Samuel Jaro; Chinnaraj, Haripriya; Rößner, Paul; Birke, Kai Peter
    Direct air capture (DAC) technologies offer a promising approach to mitigate anthropogenic climate change by enabling net negative emissions. CO2 absorption using NaOH represents an efficient solution within the proposed BlueFire carbon cycle, which integrates DAC with plasma technology for syngas production. Optimizing a DAC plant control relies on understanding the pH profile as a key parameter. A bubble column absorption model with pure CO2 was experimentally adapted for a counter‐current flow setup with ambient air, reproducing a staged pH decrease. An optimal absorption endpoint was determined by identifying the maximum slope of the pH decline, indicating high reaction progress. X‐ray diffraction analysis of the absorption products validated the theoretical model of carbonate formation.