Cyclic CO₂ Capture Performance of Carbide Slag: Parametric Study

In this work, CO₂ capture performance of carbide slag has been investigated in a thermogravimetric analyzer (TGA). Effects of operation parameters including particle size, reaction temperature and reaction duration on CO₂ capture capacity were studied. The experimental results indicate that the increase of particle size ranging from 80 to 180 μm has a positive effect on the CO₂ capture capacity of carbide slag. The sorbent reactivity decreases with an increase of calcination temperature. The prolonged exposure to carbonation conditions has a beneficial effect on sorbent behavior as a function of the number of calcination/carbonation cycles; however, the duration in the calcination step has little effect. Based on the experimental results, the reaction rate constant of carbonation reaction is obtained from Jander equation. It is found that it decreases with the increasing cycles.