Cerous hydrate

Synonyms cerous hydroxide cerium hydroxide cerous hydrate Uses... 

The simple cerous salts can be prepared by dissolving the oxide, or preferably a more reactive precursor, in the appropriate acid or, when possible, produced by precipitation from solution. Upon crystallization a wide variety of hydrated species can result. These hydrates tend to be hygroscopic. Basic salts, eg, Ce(OH)C02, maybe formed and these can be contaminants in the sohd salts. 

Hydroxide. Freshly precipitated cerous hydroxide [15785-09-8] Ce(OH)2, is readily oxidized by air or oxygenated water, through poorly defined violet-tinged mixed valence intermediates, to the tetravalent buff colored ceric hydroxide [12014-56-17, Ce(OH)4. The precipitate, which can prove difficult to filter, is amorphous and on drying converts to hydrated ceric oxide, Ce02 2H20. This commercial material, cerium hydrate [23322-64-7] behaves essentially as a reactive cerium oxide. 

Carbonate. Hydrated cerous carbonate, Ce2(C02)3 when prepared under ideal conditions tends to crystallize as cerous carbonate... 

Halides. Cerous chloride hydrate [19423-76-8] CeCl usually with n 6, on heating tends to form cerous oxychloride [15600-64-3] ... 

CeOCl. The anhydrous cerous chloride [7790-86-5] can be made from the hydrated salt by suppressing oxyhahde formation during thermal dehydration by the presence of hydrogen chloride or ammonium chloride. The anhydrous salt is soluble in a variety of organic solvents, eg, alcohols and ethers, has mp 817°C, and can be volatilized at high temperatures in vacuum. 

Miscellaneous Compounds. Among simple ionic salts cerium(III) acetate [17829-82-2] as commercially prepared, has lV2 H2O, has a moderate (- 100 g/L) aqueous solubiUty that decreases with increased temperature, and is an attractive precursor to the oxide. Cerous sulfate [13454-94-9] can be made in a wide range of hydrated forms and has solubiUty behavior comparable to that of the acetate. Many double sulfates having alkaU metal and/or ammonium cations, and varying degrees of aqueous solubiUty are known. Cerium(III) phosphate [13454-71 -2] being equivalent to mona2ite, is very stable. 

Cerous carbonate octahydrate, 5 676 Cerous carbonate trihydrate, 5 676 Cerous chloride hydrate, 5 676 Cerous fluoride, 5 676 Cerous hydroxide, 5 676 Cerous oxalate, 5 676 Cerous oxychloride, 5 676 Cerous oxyfluoride, 5 676 CerOx Corporation electrolysis cells, 9 669-670... 

Aminopyrine (4-dimethylamino-2,3-dimethyl-l-phenyl-3-pyrazo-lin-5-one) forms complexes similar to those of antipyrine, but usually containing fewer molecules of the 3-pyrazolin-5-one. Complexes with mercury, cadmium, antimony, zinc and cobalt salts include only one molecule of aminopyrine. A number of complexes with cobalt, zinc and calcium salts have two molecules of aminopyrine, some also containing acid and water of hydration.736,1322 The complex with cerous nitrate contains three molecules of aminopyrine.1238 A few other substituted... 

Ceric hydroxide, Ce(OH)4, is not known. A hydrated oxide, probably Ce20(0H)6, forms as a yellow gelatinous precipitate when ammonia or an alkali hydroxide is added to a ceric salt. It may also be prepared by the oxidation of cerous hydroxide. It dissolves in nitric acid, forming a ceric salt, in sulfuric acid yielding a partially reduced product, and in hydrochloric acid giving cerous chloride and chlorine. 

The scope of the catalytic potential of the cerium(III) ion was intimated by Pratt (1962) in an investigation of the addition of aromatic amines to quinones. Use of hydrated cerous chloride in place of cupric acetate as an oxygen carrier in the oxidation of byproduct hydroquinone resulted in improved yields and easier product separation from metal complexes. 

Hydrated antimony pentoxide Hydrated manganese dioxide Anhydrous manganese dioxide Acidic aluminium oxide Tin dioxide Zirconium phosphate Cupric sulphide Cuprous chloride Cerous oxalate Anion exchange resin Cation exchange resin... 

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