Precious metal catalystA precious metal catalyst is a material that can alter the rate of a chemical reaction without itself participating in the final product of the reaction. Almost all precious metals can be used as catalysts, but commonly used ones are platinum, palladium, rhodium, silver, ruthenium, etc. Among them, platinum and rhodium are particularly widely used. Their d-electron orbitals are not fully filled, and the surface is prone to adsorb reactants with moderate strength, which is conducive to the formation of intermediate "active compounds" and has high catalytic activity. At the same time, they also have comprehensive excellent characteristics such as high temperature resistance, oxidation resistance, and corrosion resistance, making them the most important catalyst materials.
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