Palladous oxide

Paliadiumoxydul, n. palladous oxide, palladium-(II) oxide, -nitrat, n. palladous nitrate, palladium (II) nitrate, -salz, n. palladous salt, palladium (ID salt. 

Palladous oxide,3/ PdO, may be prepared by the fusion of palladous chloride with sodium nitrate, and is an effective catalyst in hydrogenation, the most active form being produced when the fusion temperature is 600°,... 

Synonyms palladium (11) oxide palladium monoxide palladous oxide... 

The normal oxides of several other metals behave in an analogous maimer to mercuric oxide. Thus palladous oxide, PdO, decomposes when heated, yielding metallic palladium and oxygen,3 the reaction being reversible ... 

Palladous Oxide, PdO.—Palladous oxide was obtained by Berzelius by strongly heating palladium amalgam, by precipitating palladous salt solutions with alkali, as well as by fusing metallic palladium with alkalis.4... 

Palladous oxide is also obtained in the anhydrous condition by heating palladous nitrate5 to a high temperature, but the simplest and easiest method consists in hydrolysing a faintly acid solution of the nitrate by boiling with water.6... 

When palladium is heated to dull redness in oxygen palladous oxide is formed. But it is difficult to oxidise the metal completely by this method owing to the sintering of the metal, which renders oxidation slow. Palladium sponge is most suitable for the purpose, and should be heated in pure oxygen at temperatures rising slowlv from 700° C. to 840° C.7... 

The colour of palladous oxide varies according to its method of preparation. Prepared by the action of alkali upon palladous salts in aqueous solution, it has a yellowish brown colour which becomes darker on prolonged boiling. The product obtained by the hydrolytic decomposition of the nitrate is almost black, and it may well be that the extent of hydration is responsible for these changes. 

Palladous Nitrate, Pd(N03)2, may be obtained by dissolving the metal in nitric acid of density 1-35 to 1-4, and cooling the concentrated solution, when the salt crystallises out in brownish yellow, orthorhombic crystals. These are deliquescent, and readily dissolve in water, yielding a solution that is not very stable. When heated, the crystals decompose, yielding palladous oxide.2... 

Tetrahydrofuran has been prepared by the reduction of furan in the vapor phase with a nickel catalyst at 170°, in butyl alcohol at 50° with Raney nickel catalyst/ and with palladous oxide-palladium black in the absence of a solvent. ... 

A small amount of palladous oxide adheres to the casserole and cannot be removed by the ordinary means. The oxide is not dissolved readily by aqua regia but is easily removed by boiling with 48 per cent hydrobromic add. 

The acid has also been prepared by reducing p-nitrophenylarsinic acid with ferrous salt or palladous oxide. ... 

The preparation of palladous oxide-palladium black and its use as a catalyst in the reduction of organic compounds have been studied by Shriner and Adams. Palladium black and colloidal palladium have been widely used as hydrogenation catalysts. ... 

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