(476f) Enhancement of CO2 Desorption Performances in CO2 -Loaded MEA Solution By Using CMK-3 Bifunctional Catalysts

Liang, Z., Hunan University
Gao, H., Hunan University

Reduction of the required heat duty and enhancing the desorption rate for amine solvent regeneration in stripping carbon dioxide (CO2) from a CO2-rich monoethanolamine (5M MEA) solution have been identified as the major challenges in the CO2 desorption and amine regeneration process. In this study, to reduce the energy penalty four novel bifunctional heterogeneous catalysts CMK-3-SiO2 CMK-3-MCM-41 and CMK-3-SBA-15 were synthesized and introduced for the first time to study their catalytic effectiveness on CO2 desorption and monoethanolamine (MEA) solvent regeneration with an initial CO2-loading of 0.5±0.01 mol CO2/mol MEA at 97oC for 3hours. The synthesized catalysts were characterized by Fourier transform-infrared spectrometry, pyridine-infrared spectroscopy, X-ray diffraction, N2-adsorption-desorption, and ammonia-temperature programmed desorption. Based on the obtained results the newly CMK-3 mesoprose catalyst can significantly reduce the energy required for CO2 desorption and the CMK-3-SiO2 catalyst presented the highest catalytic efficiency compared to the other CMK-3 catalysts and the solid acid catalyst (SZ), 36.5% of energy required was reduced compared to 5M monoethanolamine (MEA) without catalyst and enhance the desorption rate by 73.45%. Additionally, the CMK-3-SiO2 catalyst exhibited the best catalytic performance compare to the literature with an excellent stability and had no unfavorable effects on the CO2 absorption activity by the regenerated MEA solvent.