Zirconium oxychlorides

Oxide Chlorides. Zirconium oxide dichloride, ZrOCl2 -8H2 0 [13520-92-8] commonly called zirconium oxychloride, is really a hydroxyl chloride, [Zr4(OH)g T6H2 0]Clg T2H2O (189). Zirconium oxychloride is produced commercially by caustic fusion of zircon, followed by water washing to remove sodium siUcate and to hydrolyze the sodium zirconate the wet filter pulp is dissolved in hot hydrochloric acid, and ZrOCl2 -8H2 O is recovered from the solution by crystallization. An aqueous solution is also produced by the dissolution and hydrolysis of zirconium tetrachloride in water, or by the addition of hydrochloric acid to zirconium carbonate. 

Zirconium oxychloride is an important intermediate from which other zirconium chemicals are produced. It readily effloresces, and hydrates with 5—7 H2O are common. The salt caimot be dried to the anhydrous form, and decomposes to hydrogen chloride and zirconium oxide. 

Aqueous solutions of zirconium oxide dinitrate [13826-66-9] (zirconium oxynitrate) and zirconium oxychloride behave very similarly these two compounds have been cocrystallized in soHd solution (202) where ZrO(N03 -5H2 O was the stable hydrate. 

The most common basic sulfate is 5Zr02 ASO 535. [84583-91-5] which is precipitated in good yield when a zirconium oxychloride solution is heated with the stoichiometric amount in sulfate ion. It is used to prepare high purity oxides and ammonium zirconium carbonate. 

The zirconia support was prepared by hydrolysis of zirconium oxychloride with ammonia, as already described [25]. Before its use as support, the material was calcined in air at 823 K. 

The bis(nitrilotriacetato)zirconium(IV) ion, first detected by Intorre and Martell,1 has been obtained as a hydrated potassium salt by evaporation of a solution containing zirconium oxychloride and the potassium salt of nitrilotriacetic acid. On vacuum dehydration, the anhydrous complex is formed. 

Chiavacci, L. A. Santilli, C. V. Pulcinelli, S. H. Craievich, A. F. 1997. Thermo-stimulated sol-gel transition in suspensions of sulfate-zirconium oxychloride. J. Appl. Cryst. 30 750-754. 

The synthesis of ethyl chloride from ethylene and hydrogen chloride in the presence of methane (inert) was studied in a differential reactor by Thodos Stutzman (Ind Eng Chem 50 413, 1958) over zirconium oxychloride... 

Zirconium tetrachloride decomposes in water forming zirconium oxychloride and hydrochloric acid ... 

ZrCl4 + 4N2O5 Zr(N03)4 + 4NO2CI Reaction with chlorine oxide forms zirconium oxychloride ... 

Synonyms zirconium oxychloride basic zirconium chloride dichlorooxozirco-nium... 

Farad. Boc. xiv. 10,1921) for the composition of the sols and gels of the inorganic colloidal hydroxides, e.g. zirconia produced by the hydrolysis of zirconium oxychloride. By electropotentiometric measurements of the hydrogen and chlorine ion concentrations of sols formed by hydrolysis as well as freezing point, conductivity and transport number determinations he has shown that a series of salts are formed of the types ... 

Many other inorganic pillars have been incorporated into clays for instance, calcining after ion exchange with zirconium oxychloride can create zirconia pillars. 

Compound Name Barium Peroxide Bismuth Oxychloride Zirconium Oxychloride Sulfuric Acid Benzene Hexachloride Oil Spindle Sucrose... 

Zirconium Oxide Chloride Zirconium Oxychloride Zirconium Oxychloride Hydrate Zirconium Sulfate Zirconium Sulfate Tetrahydrate Zirconyl Chloride... 

Compound Name Zirconium Oxychloride Zirconium Oxychloride Zirconium Oxychloride Zirconium Sulfate Zirconium Sulfate Zirconium Oxychloride... 

Protactinium (of mass number 231) is found in nature iu all uranium ores, since it is a long-lived member of the uranium series. It occurs in such ores to the extent of about part per million parts of uranium. An efficient method for the separation of protactinium is by a carrier technique using zirconium phosphate which, when precipitated from strongly acid solutions, coprecipitates protactinium nearly quantitatively. Then the protactinium is separated from the carrier by fractional crystallization of zirconium oxychloride. 

Zirconium demonstrates a marked preference for the formation of bonds with oxygenated species. In aqueous solution, zirconium polymers based on hydroxyl bridged species can be found. These polymeric zirconium compounds vary in size depending on conditions such as pH, concentration, and temperature. Figure 1 illustrates the crystal structure of zirconium oxychloride, which shows it to be... 

Figure 1. Tetrameric zirconium unit found in zirconium oxychloride crystals.

The laboratory-scale preparation of. zirconium tetrachloride has been accomplished through the use of a variety of techniques. Several authors4""4 report that dry zirconium oxychloride may be thermally decomposed to yield zirconium oxide and zirconium tetrachloride. These authors... 

The aqueous chemistry of zirconium is complex and dominated by hydrolysis. One aspect is that polymerization takes place when salt solutions are diluted. The polymeric species can be cationic, anionic, or neutral. Polymers that are formed include ammonium zirconium carbonate, zirconium acetate, and zirconium oxychloride. 

Li et al. reported pyrochlore-structured La2Zr2Q7 prepared by electrospinning technique from PVP/lanthanum nitrate/zirconium oxychloride as precursors, which was then calcinated at 1000 °C for 12 h, with a diameter of 100-500 run (Figure 56) (Li et al., 2006b). The fiber structure shows a low sintering ability, which could be attributed to the random stacking of fiber, resulting in a structure with low contact area between fibers. 

Inorganic precursors are much cheaper and easier to handle than metal alkoxides. Therefore the industrial production of oxide powders for ceramics and catalysts is mainly based on the precipitation or coprecipitation of inorganic salts from aqueous solutions. Gibbsite, Al(OH)3, (see Aluminum Inorganic Chemistry) is precipitated from aluminate solutions. Ti02 powders are made via the controlled hydrolysis of titanium salts. Stabilized zirconia is coprecipitated from aqueous solutions of zirconium oxychloride, ZrOC, and yttrium nitrate, YlKOsjs. 

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