Bariumperoxid

BeschreibungBarium peroxide, is a grayish-white powder that is slightly soluble in water. Barium peroxide is a dangerous fire and explosion risk in contact with organic materials and decomposes around 1450°F (787°C). It is also toxic by ingestion, is a skin irritant, and should be kept cool and dry in storage. The four-digit UN identification number is 1449. The primary uses of barium peroxide are in bleaching, in thermal welding of aluminum, as an oxidizing agent, and in the dyeing of textiles.

VerwendenBariumperoxide is used as a hydrogen peroxide source and oxygen oxidant, as well as a bleaching agent. Its main usage has been for making hydrogen peroxide and oxygen, in organic syntheses, fabric printing and dyeing. Barium peroxide is available commercially, primarily as the oxctahydrate (which is the more stable form of this peroxide).

synthetischeBarium peroxide is best prepared by reacting barium nitrate with sodium peroxide in a cold solution: Ba(NO3)2＋Na2O2＋xH2O→BaO2·xH2O＋2NaNO3 The hydrated form is usually the octahydrate. If the anhydrate is desired, the hydrated peroxide is dried and then sintered at 350°C for 10 min or less: 4BaO2·xH2O＋ heat→2BaO＋2BaO2＋xH2O＋O2 About equal amounts of oxide and peroxide form. The ratio is a function of the time and temperature of heating. To separate the two forms, the heated mass is plunged into a large volume of water where the hydroxide is formed. The peroxide is insoluble whereas the hydroxide is soluble, allowing the separation of the two by filtration. The peroxide is then vacuum dried.