Palladium is located in the periodic table the fifth cycle Ⅷ, atomic number 46, atomic weight of 106.42, 12.02 g/cm3 density (20 ℃), melting point 1550 ℃, boiling point 2900 ℃. Platinum is located in the periodic table the first Ⅷ, atomic number 78, the atomic weight of 195.09, the density of 21.45 g/cm3 (20 ℃), melting point 1768 ℃, boiling point 3827 ℃.
Palladium and platinum is malleable metal is silvery white, have great affinity for hydrogen. Spongy or palladium powder can absorb 900 times the volume of hydrogen. Palladium is one of the most active in pge, soluble in hot sulfuric acid and nitric acid, but insoluble in hydrochloric acid. Platinum chemical stability is good, does not dissolve in any single acid, soluble in aqua regia.
Palladium and platinum in industry was used as catalyst, the main purpose of and are related to the process of hydrogenation or dehydrogenation, such as palladium ?
