Reduce levels of pollutants
Honeycomb of ceramic coated with platinum and rhodium
Shape = large surface area so a little expensive metal goes a long way
Gases pass over catalyst and react to form less harmful products
carbon monoxide + nitrogen oxides ---> nitrogen + carbon dioxide
hydrocarbons + nitrogen oxides ---> nitrogen + carbon dioxide + water
1. Gases form weak bonds with the metal atoms of the catalyst (adsorption) which holds the gases in the right position to react together. They react on the surface.
2. The products then break away from the metal atoms (desorption) which frees up room for more gases to react.
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