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Palladium is the element of platinum group of the eighth group, the fifth cycle. It is discovered by British chemist Wu Ruston in ***3 from the platinum mines. It is key material used in aerospace, aviation and other high-tech fields as well as automotive industry

It can be separated from natural platinum alloy. Palladium is rare in the earth and difficult for mining and smelting, which belongs to precious metal.

The content of Palladium in the crust is about 1 × ***6%. Along with other platinum group elements, Palladium dispersed in the alluvial deposits of various mineral sand (such as raw platinum ore, nickel sulfide copper, nickel, pyrite, etc.). Their independent ore includes hexagonal palladium ore, platinum and palladium mine lead, one lead four palladium ore, palladium ore of antimony, bismuth, palladium ore of lead, tin and palladium mine, but also in free statement. The melting point of platinum is the lowest in the palladium group.

Palladium is a silver-white transition metal, soft, has good ductility and plasticity, easy for forging, rolling and drawing. Bulk metal palladium can absorb large amounts of hydrogen, so that swell into a significant volume and become and even break into pieces.

Under room temperature, 1 volume of palladium sponge can absorb **0 volumes of hydrogen, one volume of colloid palladium can absorb ***0 volume of hydrogen. Being Heated to *0 ~ *0 ℃, most of the hydrogen absorbed can be released. So it is widely used in gas reactions, especially hydrogenation or dehydrogenation catalyst, can also produce resistance line, watches and other alloys.