Shedding Light on Solid Sorbents: Evaluation of Supported Potassium Carbonate Particle Size and Its Effect on CO Capture from Air.

Solid sorbents are essential for developing technologies that directly capture CO from air. In solid sorbents, metal oxides and/or alkali metal carbonates such as potassium carbonate (KCO) are promising active components owing to their high thermal stability, low cost, and ability to chemisorb the CO present at low concentrations in air. However, this chemisorption process is likely limited by internal diffusion of CO into the bulk of KCO.