Using 13X, LiX, and LiPdAgX zeolites for CO2 capture from post-combustion flue gas

S.J. Chen, M. Zhu, Y. Fu, Y.X. Huang, Z.C. Tao and W.L. Li

Applied Energy, 2017, vol. 191, issue C, 87-98

Abstract: This work investigates the application of X zeolites for capturing CO2 from post-combustion flue gas. LiX and LiPdAgX zeolites were prepared by an ion-exchange method using 13X zeolite. X-ray diffraction analysis showed that all samples exhibited characteristic peaks of X zeolites, where the peak intensities increased in the order: LiPdAgX>LiX>13X. The enhanced intensity of the diffraction peaks can increase the activity of the X zeolites and improve their adsorption performance. Scanning electron microscopy imaging showed that the intergranular pore canals of LiPdAgX zeolite were more concentrated. Pore structure analysis indicated that addition of Li+ to the 13X zeolite enhanced the specific surface areas and pore volumes of the zeolites. Among the 13X, LiX, and LiPdAgX zeolites, LiPdAgX showed the highest CO2/N2selectivity, where the difference in the CO2 adsorption capacity was due to differences in the number of adsorption sites and thermal conductivities of the X zeolites. The CO2 breakthrough time increased in succession for the 13X, LiX, and LiPdAgX zeolites. The CO2/N2 separation factor of the LiPdAgX zeolite was twice that of the 13X zeolite at a CO2 concentration of 20vol.%. The temperature variations during the adsorption process were used to determine the regeneration energy and adsorption capacity of the X zeolites. LiPdAgX zeolite required less energy for regeneration than 13X zeolite and MEA. After regeneration, the separation factor of LiPdAgX zeolite remained at 6.38 for 20vol.% CO2 in the flue gas. Therefore, LiPdAgX zeolite can effectively capture CO2 from post-combustion flue gas to curtail the release of CO2 into the atmosphere.

Keywords: X zeolites; Microstructure; Selectivity; Separation factor; Breakthrough curve; Regeneration (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (9)

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DOI: 10.1016/j.apenergy.2017.01.031

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