In this paper, the CO2 absorption performance of diethanolamine (DEA) mixed with sodium humate as an absorbent was investigated. The promotion of CO2 absorption by diethanolamine by sodium humate was investigated in particular. Experiments were conducted to test the CO2 absorption capacity and stability of different proportions of mixed solutions by configuring different proportions of mixed solutions through the controlled variable method. The effect of concentration, temperature, and flue gas flow on the effect of sodium humate mixed with diethanolamine on CO2 absorption was studied. The results showed that the mixed solution exhibited higher CO2 absorption efficiency compared to the single component.
In the field of solid absorbents for CO2, the use of calcium-based waste for CO2 capture not only enables the resourceful use of waste but also reduces the cost of carbon dioxide capture. In this study, CaO was utilized as the calcium-based absorbent, while ZrO2 and Al2O3 were employed as modifiers. The properties of ZrO2/Al2O3/CaO composite absorber for cyclic CO2 absorption was investigated. The findings indicated that the concurrent addition of ZrO2 and Al2O3 could enhance the cyclic absorption stability and carbonation efficiency of CaO. The carbonation uptake efficiency of the absorber was enhanced by about 6% after the fifth absorption cycle compared with that without the addition of ZrO2 and Al2O3. The incorporation of ZrO2 and Al2O3 induced structural modifications in the calcium-based absorbent, providing support and separation between the CaO particles, thereby preventing void fusion. This enables the absorbent to maintain high activity and stability, while also delaying the sintering process of CaO.
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