Title: Sorption isosteres and isotherms of silver on NBG-17 graphite

Journal Article · · Journal of Nuclear Materials
 [1];  [2];  [2];  [3];  [3]
  1. Univ. of Missouri, Columbia, MO (United States); OSTI
  2. NASA Glenn Research Center, Cleveland, OH (United States)
  3. Univ. of Missouri, Columbia, MO (United States)
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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.

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
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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36 MATERIALS SCIENCE
Materials Science
Mechanistic source term
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Very high temperature reactor