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. 

The US Dept of Defense Spec for Zirconium Nitrate, Reagent is MIL-Z-11144 (10 May 1951), and specifies the following chemical requirements ... 

It can be seen from Figure 5.18 that the KD values for zirconium are higher than those for hafnium at all nitric acid concentrations. This is because the dissolution of zirconium nitrate (Zr(N03)4) into zirconyl (Zr02+) and nitrate (NOj) ions takes place to a lower extent as compared to the corresponding dissolution of hafnium nitrate in an aqueous medium. Hence, separation is feasible. However, at higher nitric acid concentrations the separation factor is reduced significantly because the dissociation of hafnium nitrate (Hf(NOs)4) decreases sharply with increasing nitric acid concentration, with the result that the separation factor, p, falls off rapidly. Hence, the separation process calls for the adjustment of the nitric acid concentration to a suitably low value. 

Figure 3.10 XPS spectra in the range from 150 to 200 eV, showing the Zr 3d and Si 2s peaks of the 7.r02/Si02 catalysts after calcination at 700 °C. All XPS spectra have been corrected for electrical charging by positioning the Si 2s peak at 154 eV. The spectra labeled nitrate correspond to the catalysts prepared by incipient wetness impregnation with an aqueous solution of zirconium nitrate, and the spectrum labeled ethoxide to that prepared by contacting the support with a solution of zirconium ethoxide and acetic acid in ethanol. The latter preparation leads to a better Zr02 dispersion over the Si02 than the standard incipient wetness preparation does, as is evidenced by the high Zr 3d intensity of the bottom spectrum (adapted from Meijers et at, [33]).

Figure 3.12 Schematic representation of the dispersion of Zr02 particles and the extent to which the silica support is covered in three Zr02/Si02 catalysts prepared by impregnation with an aqueous zirconium nitrate solution, and one prepared via an exchange reaction of the support with zirconium ethoxide. The rectangles represent 100 nm2 of silica support area, and the circles represent a half-spherical particle of Zr02 seen from above. See Table 3.3 for corresponding numbers (adapted from Meijers et al. [33]).

Zirconium nitrate is used as a preservative, as an analytical standard for zirconium, and in making zirconium salts... 

Zirconium nitrate is prepared by reacting nitric acid with zirconium oxide Zr02 + 4HNO3 —> Zr(N03)4 + 2H2O... 

Reaction with nitric acid forms zirconium nitrate and with hydrochloric acid, zirconyl chloride, ZrOCb, is produced. 

ZrCl4 4NaOH Zr(OH>4 4NaCl Reaction with dinitrogen pentoxide yields zirconium nitrate ... 

Zirconium Carbide Zirconium Hydride Zirconium Hydroxide Zirconium Nitrate Zirconium Oxide Zirconium Silicate Zirconium Sulfate Zirconium Tetrachloride Zirconyl Chloride Chemical Substances Index CAS Registry Number Index... 

Zinc Sulfate Heptahydrate Zinc Sulfocarbolate Zinc Sulfophenate Zinc Vitriol Zinc Yellow Zirconium Acetate Zirconium Acetate Solution Zirconium Nitrate Zirconium Nitrate Pentahydrate... 

Dibasic tridentate Schiff bases derived from salicylaldehydes and 2-aminobenzoic acid658 or l-amino-2-mercaptobenzene659 react with aqueous zirconium nitrate to give monomeric complexes of the type [Zr(0H)2(L)(H20)]. IR spectra of these compounds support an ONO-or ONS-tridentate attachment of the (L)2 ligands. 

Prepare the zirconium-alizarin red S paper as follows. Soak dry filter paper in a 5 per cent solution of zirconium nitrate in 5 per cent hydrochloric acid and, after draining, place it in a 2 per cent aqueous solution of sodium alizarin sulphonate (BDH Alizarin Red S ). The paper is coloured red-violet by the zirconium lake. Wash the paper until the wash water is nearly colourless and then dry in the air. 

Chiarizia, R., Jensen, M.P., Rickert, P.G. et al. 2004. Extraction of zirconium nitrate by TBP in n-octanc Influence of cation type on third phase formation according to the sticky spheres model. Langmuir 20 (25) 10798-10808. 

Siddall III, T.H. Effects of structure of V,V-disubstituted amides on their extraction of actinide and zirconium nitrates and of nitric acid, J. Phys. Chem. 64 (1960) 1863-1866. 

In contact with water, HN03 and metal salts such as uranyl nitrate, thorium nitrate, or zirconium nitrate, extractants dissolved in the diluent form small reverse micelles. Upon extraction of metal salts, the swollen micelles interact through attractive forces... 

Otherwise, the effect of uranyl or zirconium nitrates and molybdic acid on nitro and carbonyl compounds was negligible (27), while the presence of palladium reduced the yield of nitro derivative but caused an increase of the yield of carbonyl compounds (27). 

To prepare the solution we used zirconium nitrate containing 1.5 to 2.1% of hafnium in a ratio to the sum of zirconium and hafnium oxides (2 Zr(Hf)02). Initial solutions of zirconium nitrate with different concentrations of salts and nitric acid have been prepared by dissolving a concentrated water solution of zirconium nitrate salts. TBF, dissolved by o-xylol has been used as extraction media. Trials have been done in batches. The extraction media, previously saturated by nitric acid, is mixed with water solution (20 ml at a time) for 15 minutes on a vibration apparatus. Re-extraction has been done by two-step vibration of the organic phase with equal volumes of distilled water. The water phase was, after extraction and reextraction, analyzed gravimetrically to find out the contents of the sum of zirconium and hafnium oxides. Hafnium contents were determined by spectral analysis. Nitric acid concentration has been determined by titration. 

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