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REACTION OF HYDROGEN WITH URANIUM TRIOXIDE (in Russian)

Journal Article · · Doklady Akad. Nauk S.S.S.R.
OSTI ID:4077582
;
The kinetics of urauium trioxide reduction by hydrogen at temperatures from 350 to 500 deg C and hydrogen pressures of 50 to 400 mm Hg were studied in a vacuum apparatus with continuous control. The reduction, plotted as a function of time at various temperatures and P/sub H2/, proceeds at a constant rate. At constant temperature the activation energy is 20.8 kcal/mol. The final compositions preduced at various temperatures show that the reduction never reaches UO/sub 2.0/, and only at 500 deg C reaches U/sub 4/O/sub 9/. The reduction begins at 350 deg C, hence the postulation on preliminary dissociation of UO/sub 3/ in the reduction process does not hold. The plotted curves indicate UO/sub 3/ reduction to U/sub 3/O/sub 3/ by a surface reaction between hydrogen, adsorbed on the surface of the oxide, and the oxygen of the oxide. Other curves show the rate of reduction UO/sub 2x6//sub i/sub x/. The total reduction ra te is proportional to hydrogen pressure. (R.V.J.)
Research Organization:
Kirov Ural Polytechnic Inst., USSR
NSA Number:
NSA-15-006041
OSTI ID:
4077582
Journal Information:
Doklady Akad. Nauk S.S.S.R., Journal Name: Doklady Akad. Nauk S.S.S.R. Vol. Vol: 134
Country of Publication:
Country unknown/Code not available
Language:
Russian

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Related Subjects

ACTIVATION ENERGY
ADSORPTION
CHEMISTRY
CONTROL
HYDROGEN
OXIDES
OXYGEN
PRESSURE
REACTION KINETICS
REDUCTION
SURFACES
TEMPERATURE
URANIUM DIOXIDE
URANIUM OXIDES
URANIUM TRIOXIDE
VACUUM