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thumb|A range of industrial catalysts in pellet form thumb|An air filter that uses a low-temperature oxidation catalyst to convert [[carbon monoxide to less toxic carbon dioxide at room temperature. It can also remove formaldehyde from the air.]] Catalysis (, ) is the increase in rate of a chemical reaction due to an added substance known as a catalyst ( ). Catalysts are not consumed by the reaction and remain unchanged after the reaction. If the reaction is rapid and the catalyst is recycled quickly, a very small amount of catalyst often suffices; mixing, surface area, and temperature are imp