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Carbonation Rates of Dry Ca(OH)2 Mortars for CO2 Capture Applications at Ambient Temperatures
Yolanda A Criado1, J Carlos Abanades1
1CSIC-INCAR, C/Francisco Pintado Fe, 26, 33011 Oviedo, Spain.
Industrial & Engineering Chemistry Research
|October 18, 2022
Summary
Porous calcium hydroxide (Ca(OH)2) materials are effective for direct air capture of CO2. Optimal carbonation conversion requires specific relative humidity levels and material surface areas.
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- Calcium hydroxide (Ca(OH)2) is a promising material for carbon dioxide (CO2) capture.
- Understanding carbonation kinetics is crucial for optimizing direct air capture (DAC) technologies.
Purpose of the Study:
- To evaluate the suitability of porous Ca(OH)2 materials for direct air capture.
- To investigate the influence of relative humidity and material properties on CO2 sorption.
Main Methods:
- Carbonation rates of Ca(OH)2 mortars, pellets, and extrudates were measured.
- Carbonation front progression was monitored over time (1-500 h) for samples of varying thickness and porosity.
- Fick's diffusion law was applied to model carbonation evolution.
Main Results:
- Carbonation front evolution followed Fick's diffusion law under tested conditions.
- High CaCO3 conversion (>0.6) required relative humidity >50% (80-100% preferred) for low-grade Ca(OH)2 (18 m2/g).
- Higher-grade Ca(OH)2 (40 m2/g) achieved >0.8 conversion at 50% relative humidity.
Conclusions:
- Commercial Ca(OH)2 solids are applicable for direct air capture of CO2.
- Relative humidity and sorbent surface area are critical parameters for efficient carbonation.
- The study confirms the potential of these materials for scalable CO2 removal.
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