Three-way catalysts

Three-way catalysts (TWC) are designed to simultaneously convert three pollutants to harmless emissions:

  • Carbon Monoxide (CO) → Carbon Dioxide (CO2)
  • Hydrocarbons (HC) → Water (H2O)
  • Oxides of Nitrogen (NOx) → Nitrogen (N2)

A three-way catalyst can cut CO, HC and NOx by over 99% if the air to fuel ratio is accurately controlled. Three-way catalysts will only give full conversion of each of these three pollutants in a gas stream containing a stoichiometric ratio of CO and NOx.

Three way catalyst

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John Goodwin

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