Sorption isosteres and isotherms of silver on NBG-17 graphite

Walton, Kyle L.; Jacobson, Nathan S.; Kowalski, Benjamin A.; Brockman, John D.; Loyalka, Sudarshan K.

doi:10.1016/j.jnucmat.2021.153264

Sorption isosteres and isotherms of silver on NBG-17 graphite

Journal Article · Thu Aug 26 00:00:00 EDT 2021 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2021.153264· OSTI ID:1977372

Walton, Kyle L. ^[1]; Jacobson, Nathan S. ^[2]; Kowalski, Benjamin A. ^[2]; Brockman, John D. ^[3]; Loyalka, Sudarshan K. ^[3]

Univ. of Missouri, Columbia, MO (United States); OSTI
NASA Glenn Research Center, Cleveland, OH (United States)
Univ. of Missouri, Columbia, MO (United States)

Adsorption data and isotherms of various fission products on graphite are needed for high-temperature gas-cooled reactor mechanistic source term estimations. Measurements of such data for NBG-17 graphite powders, preloaded with Ag, are described. The samples were desorbed in a Knudsen-effusion mass-spectrometer. Data was sorted into adsorption isosteres for surface loadings from 23.2 to 90.4 mmolAg (kgC)^–1. Straight-line fits to the Clausius-Clapeyron representation of isosteres gave the heats of adsorption as function of surface loading. Adsorption isosteres were further refined to determine adsorption isotherms from 1050 to 1175 K. Langmuir, IAEA-Freundlich, and IAEA isotherm models were fitted to the isotherm data. Finally, the IAEA and Langmuir isotherms provided a better fit than the IAEA Freundlich isotherm.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Missouri, Columbia, MO (United States)

Sponsoring Organization:: USDOE; USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)

Grant/Contract Number:: NE0008702

OSTI ID:: 1977372

Alternate ID(s):: OSTI ID: 1818826

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: C Vol. 557; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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