Solid zirconium nitrates

Chemical Designations - Synonyms Zirconium nitrate Chemical Formula Zr(N03) 5H20. Observable Cbaracteristics - Physical State (as normally shipped) Solid Color White Odor. Nine. Physical and Chemical Properties - Physical State at 15 XI and 1 atm. Solid Molecular Weight 429.3 Boiling Point at 1 atm. Not pertinent (decomposes) Freezing Point Not pertinent Critical Temperature Not pertinent Critical Pressure Not pertinent ecific Gravity > 1 at 20 °C (solid) Vapor (Gas) Density Not pertinent Ratio of Specific Heats cf Vapor (Gas) Not pertinent Latent Heat of Vaporization Not pertinent Heat of Combustion Not pertinent Heat of Decomposition Not pertinent. 

Zirconium phosphate. Reject. Test if all the phosphate has been precipitated by the addition of a drop of the zirconium nitrate reagent if no ppt. forms, all the phosphate has been removed. Add about 0-5 g solid NH4C1, heat to boiling, add a slight excess of dilute NH3 solution (i.e. until the odour of ammonia is permanent in the boiling solution), boil for 2-3 minutes and filter. ... 

Cerium was added to the support by two different procedures, both based in the incipient wetness method. In the first procedure, zirconium hydroxide was impregnated with aqueous cerium (IV) nitrate in order to get 1 % wt of cerium in the support (support A). The second procedure consisted of calcining the hydroxide at 700 C for 4 h to obtain the oxide and then impregnation with the same cerium solution (support B). In both cases the incipient wetness technique was used to impregnate the solid. Zirconium oxide with no cerium added was prepared by calcining the hydroxide at 700 C. 

Some seemingly simple zirconium salts are best regarded as essentially covalent molecules or as complexes examples are the carboxylates Zr(OCOR)4, the tetraace-tylacetonate, the oxalate, and the nitrate. Like its Ti analogue, the last of these is made by heating the initial solid adduct of N205 and N204 obtained in the reaction... 

For the solid oxide fuel cells (SOFCs), a number of environmentally critical items have been identified (Zapp, 1996). The carrier sheet electrolyte may be produced from yttrium-stabilised zirconium oxide with added electrodes made of, e.g., LaSrMn-perovskite and NiO-cermet. Nitrates of these substances are used in manufacturing, and metal contamination of wastewater is a concern. The high temperature of operation makes the assembly very difficult to disassemble for decommissioning, and no process for recovering yttrium from the YSZ electrolyte material is currently known. 

In our first approach, a nonradioactive, representative fission-product mixture was prepared, consisting of equal masses of the desired elements. An ammonium hydroxide solution was used to dissolve molybdenum trioxide, M0O3 this solution was added to an aqueous solution containing the nitrates of cerium, palladium, and rhodium. The resulting mixture was calcined at 500°C for 17 hours, then at 550°C for an additional seven hours. The solids from the calcination were powdered and added to a blended mixture consisting of the oxides of antimony, ruthenium, samarium, strontium, yttrium, and zirconium. Cesium was then added as cesium iodide niobium was added as potassium hexaniobate,... 

MERCURIC SULFATE (7783-35-9) HgS04 Noncombustible solid. Reacts with water, forming an insoluble mercury and sulfuric acid. Light may cause slow decomposition. Incompatible with aluminum, ammonia, hydrozoic acid, magnesium, methyl isocyanoacetate, sodium acetylide, sodium peroxyborate, red phosphorus, trinitrobenzoic acid, urea nitrate, powdered zirconium. Reacts violently with gaseous hydrogen chloride above 250°F/121 C. Attacks metals in the presence of moisture. On small fires, use dry chemical powder (such as Purple-K-Powder), water spray, or COj extinguishers. 

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