Uranyl formate, decomposition

There have been many instances of examination of the effect of additive product on the initiation of nucleation and growth processes. In early work on the dehydration of crystalline hydrates, reaction was initiated on all surfaces by rubbing with the anhydrous material [400]. An interesting application of the opposite effect was used by Franklin and Flanagan [62] to inhibit reaction at selected crystal faces of uranyl nitrate hexa-hydrate by coating with an impermeable material. In other reactions, the product does not so readily interact with reactant surfaces, e.g. nickel metal (having oxidized boundaries) does not detectably catalyze the decomposition of nickel formate [222],... 

Removal of Residual Nitrate From UO Uranium trioxide produced by thermal decomposition of uranyl nitrate solution in a fluidized-bed contains a small amount (usually about 0.4 to 1.0 wt%) of residual nitrate. If UO is to be converted to UF for feed to a gaseous diffusion enrichment plant, the nitrate content of the UO must be reduced to meet UF purity specifications. Fluorination of UO in the presence of nitrate results in formation of nitrosyl and nitryl hexafluorouranates and heptafluorou-ranates (NO UF where x = 1 or 2 and y = 6 or 7) (2). These compounds form potentially troublesome solids. 

Chemiluminescence of the uranium is observed not only in solution but also in the solid phase. For instance, solid-phase decomposition of the uranyl or europium (III) persulfate leads to the formation of U02 in excited state by energy transfer mechanism, whereas electron transfer is responsible for the uranyl ion excitation (through the intermediary uranium (V)) in the oxidation of U(S04)2 by XeFj. 

The quantum yield for oxalate decomposition is relatively independent of pH for acidic solutions, in addition to being independent of temperature, concentration of reactants, and light intensity. The absorption of light by the uranyl oxalate system results in the generation of LMCT excited states. Such an absorption results in the formation of carbon dioxide and the reduced UC ion ... 

---