Hydroxy-, oxidation

Small amounts of sodium aluminate are prepared in the lab by fusion of equimolar quantities of sodium carbonate [497-19-8] and aluminum acetate [139-12-8], A1(C2H202)3, at 800°C (4). Other methods involve reaction of sodium hycboxide with amorphous alumina or aluminum [7429-90-5] metal. Commercial quantities of sodium aluminate are made from hydrated alumina, in the form of aluminum hydroxy oxide [24623-77-6], AIO(OH), or aluminum hycboxide [21645-51 -2], Al(OH)3, a product of the Bayer process (5,6) which is used to refine bauxite [1318-16-7], the principal aluminum ore. 

Commercial grades of sodium aluminate are obtained by digestion of aluminum tnhydroxide in aqueous caustic at atmospheric pressure and near the boiling temperature (7). Digestion of the aluminum hydroxy oxide in aqueous sodium hycboxide [1310-73-2] requbes pressures of up to 1.38 MPa (13.6 atm) and temperatures of about 200°C. Dry sodium aluminate is obtained by evaporation of water. Several processes for the production of sodium aluminate are known that do not reqube the addition of water. In one process, bauxite reacts with molten sodium hycboxide at approximately 400°C (8) in... 

Chelated complexes such as sodium zirconium lactate [15529-67-6] or ammonium zirconium carbonate [22829-17-0] and acidic forms such as zirconium hydroxy oxide chloride [18428-88-1] have been used in preparations in deodorants or for treatment for poison oak and poison ivy dermatitis. In such occasions, when the skin had been cut or abraded, a few users developed granulomas which have been identified as a delayed hypersensitivity to zirconium (99). These may take several weeks to develop, and commonly persist for 6 months to over a year. 

Grygar T (1995) Kinetics of electrochemical reductive dissolution of iron(III) hydroxy-oxides. Collect Czech Chem Commun 60 1261-1273. 

Grygar T (1996) Electrochemical dissolution of iron(lll) hydroxy-oxides more information about the particles. CoU Czech Chem Commun 61 93-106. 

ALUMINUMCOMPOUNDS - ALUMINIUMOXIDE(ALUMINA) - HYDRATED] (Vol 2) Aluminum hydroxy oxide [24623-77-6]... 

Alumina, impregnated with Eu(N03)3 solution and dried at 413 K, has been reported (126) to give a Mossbauer spectrum indicating the presence of a hydroxy oxide. Mossbauer studies (127) of the reduction... 

Figure 3 Schematic representation of the fundamental iron - oxygen cores foimd in many iron(III) polymeric hydroxy/oxide systems...

The hydroxy oxides, especially y boehmite, have excellent coalescing properties so they are particularly good for forming large support pellets and granules. They are also used as wash coats to provide porous surfaces for catalyst adhesion to non-porous materials such as metals and ceramics. 

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