High storage capacity and separation selectivity for C2hydrocarbons over methane in the metal-organic framework Cu-TDPAT

Abstract
We report on the storage capacity and separation selectivity of an rht-type metal-organic framework, Cu-TDPAT [TDPAT = 2,4,6-tris(3,5-dicarboxylphenylamino)-1,3,5-triazine], for C2hydrocarbons over CH4. Henry's constant, the isosteric heat of adsorption and the ideal adsorbed solution theory selectivity were calculated based on single-component sorption isotherms. Theoretical calculations indicate that both the open metal sites and the Lewis basic sites have strong interactions with the C2molecules. The combination of these two kinds of sites lead to the highest C2H2-CH4selectivity of 127.1 as well as record high values for C2H4adsorption enthalpies. To mimic real-world conditions, breakthrough experiments were conducted on an equimolar four-component mixture containing C2H2, C2H4, C2H6and CH4at room temperature and 1 atm pressure. Our results show that Cu-TDPAT is a promising candidate for CH4capture and purification. This journal is

Citation
Liu, K., Ma, D., Li, B., Li, Y., Yao, K., Zhang, Z., … Shi, Z. (2014). High storage capacity and separation selectivity for C2 hydrocarbons over methane in the metal–organic framework Cu–TDPAT. J. Mater. Chem. A, 2(38), 15823–15828. doi:10.1039/c4ta03656e

Acknowledgements
This work was supported by the National Natural Science Foundation of China (no. 21371069), the Graduate Innovation Fund of Jilin University (no. 2014008), the Specialized Research Fund for the Doctoral Program of Higher Education (no. 20110061110015) and the National High Technology Research and Development Program of China (863 program) (no. 2013AA031702).

Publisher
Royal Society of Chemistry (RSC)

Journal
J. Mater. Chem. A

DOI
10.1039/c4ta03656e

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