Platinum dioxide CAS 1314-15-4

With the progress of science and technology and the development of society, chemical products have invariably permeated our daily lives, in medicine, food, cosmetics, electronics, industry, and other areas, becoming an essential part of our lives. One such product is Platinum dioxide which has developed particularly rapidly in recent years. Do you know about Platinum dioxide ?

The official answer: Platinum dioxide, also known as platinum oxide, is called adams catalyst in organic synthesis. The chemical formula PtO2. Molecular weight 227.03. Appearance is brownish black powder or black solid; The melting point is 450 °C, the relative density is 10.2, it is insoluble in water, concentrated acid and aqua regia, and decomposes into oxygen and platinum when heated to more than 500 °C. Can be reduced by hydrogen or carbon monoxide. Heated in sulfurous acid, it can be dissolved to form platinum oxide (II.). There are a variety of hydrates, of which dihydrate and trihydrate are difficult to dissolve in sulfuric acid or nitric acid, but soluble in hydrochloric acid or sodium hydroxide solution; Monohydrate is insoluble in hydrochloric acid and even aqua resid. Generally, it is prepared by melting chemicals of chloroplatinic acid and sodium nitrate at about 500 ~ 550 °C, dissolving the remaining nitrate with water, and PtO2 powder can be prepared by filtration and separation. The trihydrate is boiled by hexachloroplatinic acid and an excess of 2mol/LNaOH, after cooling, the excess alkali is neutralized to form a yellow precipitate of hexahydroxyplatinic acid, which is heated for a long time, then changes from brown to black, that is. The trihydrate is dried with sulfuric acid in a dryer to give a dihydrate, and then the latter is heated to 100 ° C to generate a monohydrate, and then dehydrated is difficult. It is used as a catalyst for hydrogenation reactions in organic synthesis (see Catalytic hydrogenation reactions). In fact, the catalytic role is the platinum black that is reduced by hydrogen during the reaction.