Hydrogen Uptake on Coordinatively Unsaturated Metal Sites in VSB-5: Strong Binding Affinity Leading to High-Temperature D 2 /H 2 Selectivity

We examine the adsorption of hydrogen and deuterium into the nanoporous nickel phosphate, VSB-5. On the basis of gas sorption analysis, VSB-5 exhibits one of the highest measured H heats of adsorption (HOA) for hydrogen (16 kJ/mol) yet reported. This high HOA is consistent with an unusually large re...

Full description

Saved in:
Bibliographic Details
Published in:Langmuir 2017-12, Vol.33 (51), p.14586-14591
Main Authors: Sharma, Amit, Lawler, Keith V, Wolffis, Jarod J, Eckdahl, Christopher T, McDonald, Cooper S, Rowsell, Jesse L C, FitzGerald, Stephen A, Forster, Paul M
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We examine the adsorption of hydrogen and deuterium into the nanoporous nickel phosphate, VSB-5. On the basis of gas sorption analysis, VSB-5 exhibits one of the highest measured H heats of adsorption (HOA) for hydrogen (16 kJ/mol) yet reported. This high HOA is consistent with an unusually large red shift in the Q(1) and Q(0) hydrogen vibrational modes as measured with in situ infrared spectroscopy. The HOA for D is measured to be 2 kJ/mol higher than that for H . "Ideal adsorbed solution theory" analysis of H and D isotherms provides selectivities above 4 for deuterium at 140 K, suggesting that VSB-5 is a promising adsorbent for pressure-swing adsorption-type separations of hydrogen isotopes.
ISSN:0743-7463
1520-5827
DOI:10.1021/acs.langmuir.7b03580