Enhancing CO2 desorption performance in rich MEA solution by addition of SO42−/ZrO2/SiO2 bifunctional catalyst

Zain Ali Saleh Bairq, Hongxia Gao, Yufei Huang, Haiyan Zhang and Zhiwu Liang

Applied Energy, 2019, vol. 252, issue C, -

Abstract: A significant impediment to the widespread adoption of amine-based post-combustion technique for CO2 capture from flue gas is the huge energy demand for amine solvent regeneration. In this study, five novel bifunctional heterogeneous catalysts e.g., SO42−/ZrO2/SiO2 with different molar ratios of zirconia and SO42−/ZrO2 as a parent catalyst were synthesized and applied to evaluate their effectiveness in enhancing the CO2 desorption and solvent regeneration of 5M monoethanolamine solution with CO2 loading of 0.5 ± 0.01 mol CO2/mol monoethanolamine at 97 °C. The catalysts were characterized by Fourier transform-infrared spectrometry, pyridine-infrared spectroscopy, X-ray diffraction, N2-adsorption-desorption, and ammonia-temperature programmed desorption. The results demonstrated that these catalysts can significantly reduce the heat duty for CO2 desorption by 36.48% compared to without catalyst and enhance desorption rate by 35.1%. The results also showed that SO42−/ZrO2/SiO215% presented the highest efficiency compared to the other SO42−/ZrO2/SiO2 ratios and the super solid acid catalyst SO42−/ZrO2. Additionally, to investigate if the catalysts induce any unfavorable effects on the amine, the absorption of CO2 by regenerated amine solvent was studied. Finally, a reaction mechanism for the amine solvent regeneration with the synthesized catalyst e.g., SO42−/ZrO2/SiO2 was suggested.

Keywords: Amine regeneration; CO2 capture; Relative heat duty; Synthesized solid acid catalyst; Enhancing desorption rate; CO2- rich MEA stripping (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (6)

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DOI: 10.1016/j.apenergy.2019.113440

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