Tube effects and the kinetics of desorption of H sub 2 O/H sub 2 from LiAlO sub 2 by temperature programmed desorption measurements
Temperature programmed desorption (TPD) measurements are in progress to provide data describing the kinetics of desorption of H{sub 2}O(g) and H{sub 2}(g) from ceramic tritium breeders. Preliminary blank experiments indicated that the steel can be a reactive participant with H{sub 2}O being consumed and H{sub 2} being evolved. There is also evidence of some dissolution of H{sub 2} in the steel. However, it is possible to stabilize the tube in the absence of added H{sub 2} so that useful measurements with H{sub 2}O(g) can be made. Initial work is on the LiAlO{sub 2}-H{sub 2}O(g) system. Fresh samples of LiAlO{sub 2} bear large amounts of adsorbed H{sub 2}O. TPD spectra were measured for LiAlO{sub 2} that had been equilibrated with 200 ppM H{sub 2}O(g) at temperatures from 473 to 773 K. Several techniques of data analysis were applied. There still remain questions of possible peak overlap to resolve for all cases. An activation energy of desorption of H{sub 2}O(g) of approximately 120 kJ/mol appears to be associated with the sample equilibrated at 673 K. When compared with the same value reported in the literature for decomposition of LiOH, this result suggests that some sites on LiAlO{sub 2} might resemble sites on Li{sub 2}O in their adsorptive properties. For the 773 K equilibration, the activation energy of desorption appears considerably higher. 6 refs., 4 figs.
- Research Organization:
- Argonne National Lab., IL (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5239898
- Report Number(s):
- CONF-891204-16; ON: DE90004880; TRN: 90-001685
- Resource Relation:
- Conference: 4. international conference on fusion reactor materials, Kyoto (Japan), 4-8 Dec 1989
- Country of Publication:
- United States
- Language:
- English
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LITHIUM OXIDES
DEGASSING
ACTIVATION ENERGY
ADSORPTION
BREEDING BLANKETS
DESORPTION
TEMPERATURE DEPENDENCE
THERMONUCLEAR REACTOR MATERIALS
TRITIUM
WATER
ALKALI METAL COMPOUNDS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHALCOGENIDES
ENERGY
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
LITHIUM COMPOUNDS
MATERIALS
NUCLEI
ODD-EVEN NUCLEI
OXIDES
OXYGEN COMPOUNDS
RADIOISOTOPES
REACTOR COMPONENTS
SORPTION
YEARS LIVING RADIOISOTOPES
700209* - Fusion Power Plant Technology- Component Development & Materials Testing