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A catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any perminent chemical change.
Exhaust that come from cars actually contains many harmful substances. So harmful that in the 70's the government mandated the adoption of catalytic converters. Catalytic converters are devices that employ a catalyst to transform pollutants in the exhaust to less harmful substances.
Catalyst actually helped compose many common reactions such as,
Kircchof,Davy, and Berzelius' contributions is what helped us to define catalyst as what they are today by running a serious of trials and drawing certain theories, each different in there own way.
In 1812, a Russian chemist by the name of Gottlieb Kirccof noticed when a suspension of starch in water was boiled nothing changed in the starch. However, when he added a few drops of concentrated acid before boiling the suspension, he received a very different result. This time the starch had broke down to form glucose while the acid underwent no change.