A comparison between CO₂ capturing capacities of fly ash based composites of MEA/DMA and DEA/DMA
2013
Sarmah, Mridusmita | Baruah, Bimala P. | Khare, Puja
Two classes of amine fly ash based composites (FAA₁₃ and FAA₂₃) are prepared and evaluated as CO₂ adsorbents. FAA₁₃ is prepared from primary and tertiary amines (MEA/DMA) while FAA₂₃ (DEA/DMA) is prepared from secondary and tertiary amines. Composites were characterized by elemental analyses such as Scanning electron microscope (SEM-EDX), UV–Visible, Fourier Transform Infra Red (FT-IR), carbon, hydrogen, nitrogen (CHN) and Thermo-gravimetric Analysis (TGA). A temperature-programmed degradation study shows a much higher stability in comparison with other known simple amine solvents. Carbamate-amine is formed by the reaction of fly ash–amine composite with CO₂. Results showed the maximum adsorptions of CO₂ of 6.89 and 5.99mmol/g on FAA₁₃ and FAA₂₃ respectively. Kinetics of CO₂ on the composites was described by the linear driving force (LDF) model. The diffusion coefficients and activation energies of CO₂ in the composites ranged between 6.33×10⁻¹²±7×10⁻¹²cm²/s and 0.377±0.184kJ/mol respectively at atmospheric pressure and 306K. The prepared composites are thermally stable. A comparison of material cost and adsorption capacity showed that they are cheap and efficient for CO₂ capturing.
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