Metal-organic frameworks as adsorbents for hydrogen purification and pre-combustion carbon dioxide capture

Herm, Zoey R. ; Swisher, Joseph A. ; Smit, Berend ; Krishna, Rajamani ; Long, Jeffrey R. (2011) Metal-organic frameworks as adsorbents for hydrogen purification and pre-combustion carbon dioxide capture Journal of the American Chemical Society, 133 (15). pp. 5664-5667. ISSN 0002-7863

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Official URL: http://pubs.acs.org/doi/abs/10.1021/ja111411q

Related URL: http://dx.doi.org/10.1021/ja111411q

Abstract

Selected metal-organic frameworks exhibiting representative properties-high surface area, structural flexibility, or the presence of open metal cation sites-were tested for utility in the separation of CO2 from H2 via pressure swing adsorption. Single-component CO2 and H2 adsorption isotherms were measured at 313 K and pressures up to 40 bar for Zn4O(BTB)2 (MOF-177, BTB3- = 1,3,5-benzenetribenzoate), Be12(OH)12(BTB)4 (Be-BTB), Co(BDP) (BDP2-= 1,4-benzenedipyrazolate), H3[(Cu4Cl)3(BTTri)8] (Cu-BTTri, BTTri3− = 1,3,5-benzenetristriazolate), and Mg2(dobdc) (dobdc4− = 1,4-dioxido-2,5-benzenedicarboxylate). Ideal adsorbed solution theory was used to estimate realistic isotherms for the 80:20 and 60:40 H2/CO2 gas mixtures relevant to H2 purification and precombustion CO2 capture, respectively. In the former case, the results afford CO2/H2 selectivities between 2 and 860 and mixed-gas working capacities, assuming a 1 bar purge pressure, as high as 8.6 mol/kg and 7.4 mol/L. In particular, metal-organic frameworks with a high concentration of exposed metal cation sites, Mg2(dobdc) and Cu-BTTri, offer significant improvements over commonly used adsorbents, indicating the promise of such materials for applications in CO2/H2 separations.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:65312
Deposited On:17 Oct 2011 03:33
Last Modified:17 Oct 2011 03:33

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