DEHYDRATION KINETICS AND EQUILIBRIUM WATER VAPOR ADSORPTION BY THORIA GEL. Technical Report No. XX

Technical Report · Wed Jul 31 04:00:00 EDT 1963

OSTI ID:4638731

Chun, B D; Wadsworth, M E; Olson, F A

ABS>Equilibria and kinetic studies of thoria gel dehydration indicated that water adsorbed in the temperature range room temperature to about 140 deg C is hydrogen bonded in a state very similar to liquid water. The principal difference is that the hydrated water is somewhat less ordered (slightly larger entropy) than liquid water and the equilibrium temperature at one atmosphere water vapor partial pressure is 137 deg C instead of 100 deg C for bulk water equilibrium. In order for the thoria to adsorb water by hydrogen bonding in a manner similar to bulk water it is evident that up to 140 deg C, surface species such as hydroxyls, nitrates, and possibly carbonates must be the adsorption sites. The bulk of the dehydration at temperatures up to about 140 deg C is first order. There is evidence from the entropy of activation that the water in the activated complex, i.e., configuration for desorption, is highly ordered. (auth)

• Research Organization: Utah. Univ., Salt Lake City. Inst. of Metals and Explosives Research
• NSA Number: NSA-17-035705
• OSTI ID: 4638731
• Report Number(s): TID-19276
• Country of Publication: United States
• Language: English

Related Subjects

ADSORPTION
CARBONATES
CHEMICAL REACTIONS
CHEMISTRY
HYDROXIDES
LIQUIDS
LOW TEMPERATURE
NITRATES
REACTION KINETICS
THERMODYNAMICS
THORIUM OXIDES
VAPORS
WATER