Nickel nitrate, ammonia

Ma.nufa.cture. Several nickel oxides are manufactured commercially. A sintered form of green nickel oxide is made by smelting a purified nickel matte at 1000°C (30) a powder form is made by the desulfurization of nickel matte. Black nickel oxide is made by the calcination of nickel carbonate at 600°C (31). The carbonate results from an extraction process whereby pure nickel metal powder is oxidized with air in the presence of ammonia (qv) and carbon dioxide (qv) to hexaamminenickel(TT) carbonate [67806-76-2], [Ni(NH3)3]C03 (32). Nickel oxides also ate made by the calcination of nickel carbonate or nickel nitrate that were made from a pure form of nickel. A high purity, green nickel oxide is made by firing a mixture of nickel powder and water in air (25). 

The mixed chromium and nickel (5% and 10% Ni atomic) catalysts were prepared by dehydration of mixed chromium and nickel hydroxides prepared by adding an ammonia solution to a solution of chromium and nickel nitrate in order to maintain a pH = 7 1. The final pH was equal to 7.S. The hydroxyde treatment was the same as the one already described for chromium oxide. 

Note During the investigation of various methods of preparation, it was observed by Barlot (Ref 2) that if solns of equimolecular amounts of nickel nitrate and hydrazine nitrate are mixed no precipitation is observed. If, however, some hydrazine, or ammonia is added, an immediate precipitation of pink complex is observed... 

Tetrammino-nickel Nitrate, [Ni(NH3)4](N03)2.H 0, is obtained by the addition of ammonia to a solution of nickel nitrate and the addition of alcohol to the well-cooled liquid. The precipitated ammine crystallises in large transparent octahedra of a blue colour. It decomposes in air with loss of ammonia, and falls to a bluish-white powder. On heating it melts, loses water and ammonia, leaving a residue of 1 Werner, Ber., 1914, 47, 3087. 

Hexammino - nickel Nitrate, [Ni(NH3)6](N03)2, is prepared by the action of dry ammonia gas on anhydrous nickel nitrate.2 It is decomposed by water. 

T rihydr azino - nickel Nitrate, [Ni(N2H4)3](N03)2.—Hydrazine may take the place of ammonia, yielding a derivative with properties resembling those of the ammines.5... 

Preparation of Hexaamminenickel(II) Chloride. Dissolve 25 g of nickel nitrate in the smallest possible amount of water and add an amount of a 25% ammonia solution such that the initially formed precipitate would completely dissolve. If the initial salt was insuf-... 

Nickel as a Catalyst.—A mixture of nitric oxide and hydrogen passed over reduced nickel yields ammonia. The reaction, which is nearly quantitative, begins at 300° C., but when once it has set in the temperature may be lowered to 120° C. Nitric oxide alone, however, on being passed over reduced nickel does not yield any nitride, nitrite, or nitrate.10 When sulphur dioxide and hydrogen are passed over nickel at dull red heat, hydrogen sulphide is formed, and hydrogen phosphide results when hydrogen is passed over a mixture of reduced nickel and... 

When alcohol is added to a solution of nickel nitrate in aqueous ammonia, blue octahedral crystals of the monokydrated tetrammoniate, Ni(N03)2.4NH3.H20, separate out. These are unstable in air.2... 

If a carrier is to be incorporated in the final catalyst, the original precipitation is usually carried out in the presence of a suspension of the finely divided support or, alternatively, a compound or suspension, which will eventually be converted to the support, may initially be present in solution. Thus, a soluble aluminum salt may be converted to aluminum hydroxide during precipitation and ultimately to alumina. Alternatively, a supported nickel catalyst could be prepared from a solution of nickel nitrate, containing a suspension of alumina, by precipitation of a nickel hydroxide with ammonia. 

Nickel hydroxide was precipitated from a solution of nickel nitrate with an aqueous solution of ammonia in the presence of a suspension of carrier hydrogel or xerogel. The precipitate on the carrier was filtered... 

The stability constant of a complex of pyrophosphate with Ni (presumably NiPjO though this is not specified by the authors) was measured by an amperometric titration procedure. Small amounts of the nickel nitrate salt were titrated with the pyrophosphate in an ammonium nitrate buffer solution (0.1 M), adjusted to a pH value of 8 with aqueous ammonia. A Pb02 indicating electrode was used with a platinum foil coimter electrode and a saturated calomel reference electrode. The procedure was found to be very sensitive to pyrophosphate even in the presence of phosphate. 

All coppei -nickel catalysts were prepared from the magnetically pure copper which was itself completely inactive in the hydrogenation of benzene under the conditions described below. Cupric hydroxide was precipitated from a nitrate solution by dilute ammonium hydroxide solution so that the supernatant liquid was faintly colored by the copper-ammonia complex. The precipitate was filtered and washed. Nickel nitrate in water solution was now added in the proportion desired, and the mixture was stirred to a paste of even consistency. It was dried at 95°, ignited at 180° for 36 hours, and finally at 400° for 20 hours. The oxide mixture was reduced in purified hydrogen at 150° for 20 hours. Most finished catalysts contained 1.0 per cent of nickel. 

The vendor claims that the following metals have been successfully treated to parts per biUion (ppb) and detection limit levels aluminum, arsenic, cadmium, chromium, cobalt, copper, iron, lead, manganese, mercury, molybdenum, nickel, selenium, silver, tin, uranium, vanadium, and zinc. The system is also able to remove ammonia, nitrates, phosphates, potassium, fluorides, and sodium. Studies have also been performed using Aqua-Fix to remove radionuchdes such as uranium from waste streams. 

If finely divided nickel is mixed with silver nitrate in presence of liquid ammonia at low temperature and ammonia allowed to evaporate spontaneously in absence of moisture, pale violet crystals of composition Ni(N03)2.9NH3 separate. The substance decomposes on treatment with -water, with formation of metallic hydroxide and evolution of ammonia.3... 

Synonym Ammonia Water Amfbnioformaldehyde Ammonium Acetate Ammonium Acid Fluoride Ammonium Amidosulfonate Ammonium Amidosulphate Ammonium Benzoate Ammonium Bicarbonate Ammonium Bichromate Ammonium Bifluoride Ammonium Carbonate Ammonium Chloride Ammonium Citrate Ammonium Citrate, Dibasic Ammonium Decaborate Octahydrate Ammonium Dichromate Ammonium Disulfate-Nickelate (II) Ammonium Ferric Citrate Ammonium Ferric Oxalate Trihydrate Ammonium Ferrous Sulfate Ammonium Fluoride Ammonium Fluosilicate Ammonium Formate Ammonium Gluconate Ammonium Hydrogen Carbonate Ammonium Hydrogen Fluoride Ammonium Hydrogen Sulfide Solution Ammonium Hydroxide Ammonium Hypo Ammonium Hyposulfite Ammonium Iodide Ammonium Iron Sulfate Ammonium Lactate Ammonium Lactate Syrup Ammonium Lauryl Sulfate Ammonium Molybdate Ammonium Muriate Ammonium Nickel Sulfate Ammonium Nitrate Ammonium Nitrate-Urea Solution Ammonium Oleate... 

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