Criado et al. (2026): Operating parameters and sorbent properties affecting Ca(OH)₂ carbonation for direct air capture (DAC) applications

Yolanda A. Criado, Carlos Bajo, Loreto Suarez and Roberto García, IN: Chemical Engineering Journal, https://doi.org/10.1016/j.cej.2026.179644

Direct Air Capture (DAC) based on Ca(OH)₂ carbonation has emerged as a promising route for atmospheric CO₂ removal. However, the maximum attainable carbonation conversion (XMax), a key parameter governing sorbent utilization and process performance, is strongly influenced by operating conditions and sorbent properties. In this work, XMax was investigated over a wide range of CO₂ concentrations (500–120,000 ppm), relative humidity (10–95%), and temperatures (30–80 °C), using both commercial standard and high-surface-area Ca(OH)₂ materials.

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