Title

Temperature-programmed Desorption For Isotope Separation In Nanoporous Materials

Document Type

Article

Publication Date

1-1-2018

Publication Title

Journal of Physical Chemistry C

Publisher

American Chemical Society

Volume

122

Issue

4

First page number:

1995

Last page number:

2001

Abstract

Hydrogen isotope separation based on differences in quantum zero-point energy was investigated using a novel temperature-programmed desorption approach. Spectra obtained as a function of hydrogen concentration reveal multiple distinct binding sites that correlate with the crystallographic structure of the particular material. In each case, the higher mass isotope desorbs at a characteristic temperature higher than that of the lower mass counterpart. Materials with greater binding energy exhibit a larger difference in characteristic temperature between D2 and H2 but also a broader desorption profile. Simulations based on the standard Polanyi-Wigner equation reveal this broadening to be an intrinsic property present in all higher binding energy materials. As such, the key factor in temperature desorption separation is not the absolute difference in binding energy of the two species but rather the fractional difference. © 2018 American Chemical Society.

Language

English

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