CO 2 Desorption in Single and Blended Amine Solvents with and without Catalyst

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Abstract

In this work, various single and blended amines (namely, MEA, MEA-DEEA, MEA-MDEA, MEA-1DMA2P) with three types of catalysts (H-ZSM-5, MCM-41 and SO 42- /ZrO 2 ) were studied to determine the respective roles of catalyst and solvent in heat duty for solvent regeneration and rate of CO 2 desorption during the desorption of CO 2 from the solvents having an initial CO 2 loading of 0.5 mol CO 2 /mol amine at 371 K. The results show that performance of the three catalysts in all the four investigated aqueous solution systems followed the trend: H-ZSM-5 > MCM-41 > SO 42- /ZrO 2 . These results highlight the fact that even though HZSM-5 has moderate acidic sites (MAS) as compared to MCM-41 and SO 42- /ZrO 2 , its large Brønsted/Lewis (B/L) acid sites ratio coupled with mesopore surface area (MSA) had the greatest effect on heat duty for CO 2 desorption as well as rate of CO 2 desorption. Furthermore, based on this study, the blended system of aqueous 5 M MEA+1 M MDEA with H-ZSM-5 provided the best approach for solution regeneration because the strong electron withdrawing chemical structure of MDEA made the solution most prone to CO 2 desorption as compared with 1DMA2P and DEEA.

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Zhang, X., Liu, H., & Liang, Z. (2017). CO 2 Desorption in Single and Blended Amine Solvents with and without Catalyst. In Energy Procedia (Vol. 114, pp. 1862–1868). Elsevier Ltd. https://doi.org/10.1016/j.egypro.2017.03.1316

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