Synthesis and thermoanalytical characterization of samarium peroxocarbonate

Kinetic Study of the Oxidative Dissolution of UO2 in Aqueous Carbonate Media

“…Single-crystal X-ray analysis of a precipitate formed from a uranyl(VI) peroxocarbonate solution identified a molecular mononuclear U(VI) structure, K 4 UO 2 (O 2 )(CO 3 ) 2 , with the peroxide and carbonate ligands bidentately coordinated in the equatorial plane to the U(VI) metal center . Similar binding geometries have been reported for another uranium(VI) peroxocarbonate compound, as well as for lanthanide peroxocarbonates. , These structural data, in conjunction with the data shown in Figure B, suggest that the solution species present 4 h after dissolution has the composition UO 2 (O 2 )(CO 3 ) 2 4- .…”

Solubility behavior of rare earths with ammonium carbonate and ammonium carbonate plus ammonium hydroxide: Precipitation of their peroxicarbonates

“…de Vasconcellos et al [7,8] exploited the selective dissolution of yttrium in ammonium carbonate starting from an industrial low cerium carbonate concentrate. Queiroz et al [9,10] reported that the addition of hydrogen peroxide to the carbonate rare earths complexes forms a precipitate, identified as rare earth peroxicarbonates. The present work discusses the dissolution behavior of the REE using a binary mixture of ammonium carbonate with ammonium hydroxide forcing the maximum dissolution of these rare earths.…”

The Effects of Alkaline Earth Metals on Catalytic Activities of K−Sm-Based Catalysts for Diesel Soot Oxidation

“…However, for the other three catalysts, with an increase in KNO 3 content, the Sm 2 O 2 CO 3 content is increased. As the decomposition temperature of Sm 2 O 2 CO 3 was over 600 °C, the increase in CO 2 concentration below 300 °C on the TPR curves in Figure a is caused by the physical desorption of CO 2 , not the decomposition of Sm 2 O 2 CO 3 . The peak at 480 °C may be caused by the decomposition of Sm 2 (CO 3 ) 3 to Sm 2 O 2 CO 3 .…”