Open AccessSUMMARY OF RUNS D-77 THROUGH D-93. RATE OF OXIDATION OF CHROMIUM(III) IN DILUTE URANYL SULFATE SOLUTION IN THE PRESENCE OF RUTHENIUM
Author(s) -
Earl S. Snavely,
R. Greeley,
S.R. Buxton
Publication year - 1959
Language(s) - English
Resource type - Reports
DOI - 10.2172/4103919
Subject(s) - ruthenium , chromium , chemistry , catalysis , uranyl , activation energy , inorganic chemistry , desorption , oxygen , reaction rate , sulfate , adsorption , organic chemistry , ion
The rate of oxidation of chromium(III) to chromium(VI), catalyzed by ruthenium, was determined at various temperatures and oxygen concentrations. The rate at 300 deg C was too rapid for measurement by aliquot sampling. In the temperature range of 225 to 275 deg C, oxidation was rapid and the rate increased with oxygen concentration. A linear dependence of initial oxidation rate on the reciprocal of chromium(VI) concentration suggested that a rate-controlling step in the reaction mechanism may be desorption of chromium(VI) from the ruthenium catalyst. The activation energy calculated for the reaction is 19 kcal/mole. (auth