ADSORPTION OF SULFATES ON THORIA AT ELEVATED TEMPERATURES (thesis)

Technical Report · Wed Jun 01 04:00:00 EDT 1960

OSTI ID:4070768

Hausenfleck, C H

The adsorption of sulfates from aqueous solutions of potassium bisulfate and sodium sulfate on thoria under hydrothermal conditions was investigated at 100 to 290 deg C. The amount of adsorption as a function of temperature and sulfate concentration was determined. Sulfate adsorption on samples of ThO/sub 2/ , having a nitrogen surface area of 32.4 m/sup 2//gm, was found to increase with temperature and increasing H/sup +/ concentration up to 205 deg C. Above this temperature a decrease in the amount adsorbed was noted. The adsorbed specie was identified as HSO/sub 4/ ion. The data obtained suggest an esterification reaction involving molecular H/sub 2/SO/sub 4/ and surface ThOH sites with the subsequent splitting out of water. Adsorption isotherms obtained for a series of temperatures are of the form that indicates the reaction is one of chemisorption in which the standard free energy of adsorption varies with the absolute temperature and with the extent of surface coverage. Calculation of the activation energy and the entropy of adsorption for the process gave values of 10.0 kcal and 99 eu, respectively. The abnormally large positive entropy is explained in terms of the splitting out of water from the surface of thoria. (auth)

• Research Organization: Utah. Univ., Salt Lake City
• NSA Number: NSA-15-005358
• OSTI ID: 4070768
• Report Number(s): AD-239768
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ACTIVATION ENERGY
ADSORPTION
ENTROPY
ESTERS
EXCITATION
FREE ENERGY
LATTICES
METALS, CERAMICS, AND OTHER MATERIALS
NITROGEN
POTASSIUM SULFATES
SODIUM SULFATES
SOLUTIONS
SULFATES
SULFURIC ACID
SURFACES
TEMPERATURE
THERMODYNAMICS
THORIUM HYDROXIDES
THORIUM OXIDES
WATER