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Title: Structural stability of 1100[degree]C heated Pd/k during absorption cycling in protium. [Palladium supported on kieselguhr]

Abstract

Pd/k is a hydride forming packing material which is used in the Thermal Cycling Absorption Process (TCAP). Palladium is supported on kieselguhr to create a packing material which will provide adequate void space to prevent excessive pressure drops and flow restrictions. The use of unsupported palladium would result in blockage of columns and clogging of filters due to the small particle size of unsupported palladium hydride powder. During pilot scale demonstrations, it was noted that the Pd/k packing material had degraded causing severe flow restrictions within the TCAP column. A solution to the problem involved the heating of Pd/k at 1,110[degree]C to strengthen the packing material, and render it more resistant to breakdown. The 1, 100[degree]C heated Pd/k has been shown to be more resistant to mechanical breakdown than the Pd/k prior to heat treatment. Two primary modes of Pd/k particle degradation have been identified: mechanical breakdown caused by particle fluidization and degradation caused by absorption/desorption cycling. Absorption/desorption cycling causes the palladium particles within the packing to expanded and contract upon formation and decomposition of the hydride, respectively. This expansion and contraction causes large localized stresses within the packing material, which if these stresses can not be accommodated within themore » packing will cause the material to crack and degrade. The purpose of this report is to document the results of the absorption/desorption cycling of 1,100[degree]C heated Pd/k and compare these results to the results obtained from the absorption/desorption cycling of Pd/k which had not been heated at 1, 100[degree]C.« less

Authors:
Publication Date:
Research Org.:
Savannah River Site (SRS), Aiken, SC (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
6204022
Report Number(s):
WSRC-RP-93-401
ON: DE93016270
DOE Contract Number:  
AC09-89SR18035
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COMPOSITE MATERIALS; HEAT TREATMENTS; MECHANICAL PROPERTIES; DIATOMACEOUS EARTH; PALLADIUM; TRITIUM; ADSORPTION; DESORPTION; COMPARATIVE EVALUATIONS; DISTRIBUTION; EXPERIMENTAL DATA; FLOW RATE; FRAGMENTATION; GAS FLOW; MEASURING INSTRUMENTS; PALLADIUM HYDRIDES; PARTICLE SIZE; SAVANNAH RIVER PLANT; SCANNING ELECTRON MICROSCOPY; STORAGE; TEMPERATURE RANGE 1000-4000 K; THERMAL CYCLING; THERMAL EXPANSION; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; DATA; ELECTRON MICROSCOPY; ELEMENTS; EVALUATION; EXPANSION; FLUID FLOW; HYDRIDES; HYDROGEN COMPOUNDS; HYDROGEN ISOTOPES; INFORMATION; ISOTOPES; LIGHT NUCLEI; MATERIALS; METALS; MICROSCOPY; NATIONAL ORGANIZATIONS; NUCLEI; NUMERICAL DATA; ODD-EVEN NUCLEI; PALLADIUM COMPOUNDS; PLATINUM METALS; RADIOISOTOPES; SIZE; SORPTION; TEMPERATURE RANGE; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; US AEC; US DOE; US ERDA; US ORGANIZATIONS; YEARS LIVING RADIOISOTOPES; 360603* - Materials- Properties; 360601 - Other Materials- Preparation & Manufacture

Citation Formats

Fisher, I A. Structural stability of 1100[degree]C heated Pd/k during absorption cycling in protium. [Palladium supported on kieselguhr]. United States: N. p., 1993. Web. doi:10.2172/6204022.
Fisher, I A. Structural stability of 1100[degree]C heated Pd/k during absorption cycling in protium. [Palladium supported on kieselguhr]. United States. https://doi.org/10.2172/6204022
Fisher, I A. 1993. "Structural stability of 1100[degree]C heated Pd/k during absorption cycling in protium. [Palladium supported on kieselguhr]". United States. https://doi.org/10.2172/6204022. https://www.osti.gov/servlets/purl/6204022.
@article{osti_6204022,
title = {Structural stability of 1100[degree]C heated Pd/k during absorption cycling in protium. [Palladium supported on kieselguhr]},
author = {Fisher, I A},
abstractNote = {Pd/k is a hydride forming packing material which is used in the Thermal Cycling Absorption Process (TCAP). Palladium is supported on kieselguhr to create a packing material which will provide adequate void space to prevent excessive pressure drops and flow restrictions. The use of unsupported palladium would result in blockage of columns and clogging of filters due to the small particle size of unsupported palladium hydride powder. During pilot scale demonstrations, it was noted that the Pd/k packing material had degraded causing severe flow restrictions within the TCAP column. A solution to the problem involved the heating of Pd/k at 1,110[degree]C to strengthen the packing material, and render it more resistant to breakdown. The 1, 100[degree]C heated Pd/k has been shown to be more resistant to mechanical breakdown than the Pd/k prior to heat treatment. Two primary modes of Pd/k particle degradation have been identified: mechanical breakdown caused by particle fluidization and degradation caused by absorption/desorption cycling. Absorption/desorption cycling causes the palladium particles within the packing to expanded and contract upon formation and decomposition of the hydride, respectively. This expansion and contraction causes large localized stresses within the packing material, which if these stresses can not be accommodated within the packing will cause the material to crack and degrade. The purpose of this report is to document the results of the absorption/desorption cycling of 1,100[degree]C heated Pd/k and compare these results to the results obtained from the absorption/desorption cycling of Pd/k which had not been heated at 1, 100[degree]C.},
doi = {10.2172/6204022},
url = {https://www.osti.gov/biblio/6204022}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Mar 12 00:00:00 EST 1993},
month = {Fri Mar 12 00:00:00 EST 1993}
}