Highly Selective Quantum Sieving of D2 from H2 by a Metal–Organic Framework As Determined by Gas Manometry and Infrared Spectroscopy
The quantum sieving effect between D2 and H2 is examined for a series of metal–organic frameworks (MOFs) over the temperature range 77–150 K. Isothermal adsorption measurements demonstrate a consistently larger isosteric heat of adsorption for D2 vs H2, with the largest difference being 1.4 kJ/mol in the case of Ni-MOF-74. This leads to a low-pressure selectivity for this material that increases from 1.5 at 150 K to 5.0 at 77 K. Idealized adsorption solution theory indicates that the selectivity decreases with increasing pressure, but remains well above unity at ambient pressure. Infrared measurements on different MOF materials show a strong correlation between selectivity and the frequency of the adsorbed H2 translational band. This confirms that the separation is predominantly due to the difference in the zero-point energies of the adsorbed isotopologues.
FitzGerald, S.A., C.J. Pierce, J.L.C. Rowsell, E.D. Bloch, and J.A. Mason, 2013. “Highly Selective Quantum Sieving of D2 from H2 by a Metal–Organic Framework As Determined by Gas Manometry and Infrared Spectroscopy.” Journal of Amercian Chemical Society 135(25): 9458-64.
American Chemical Society
Journal of Amercian Chemical Society
Physics and Astronomy
Chemistry and Biochemistry
Stephen FitzGerald, Physics and Astronomy
Jesse L.C. Rowsell, Chemistry and Biochemistry
Iron(II), Coordination sites, Hydrogen adsorption, Isotope-separation, Carbon dioxide, Diffraction, Zeolites, Polymer, Binding design