• Contaminants in the exhaust gas (HC, CO, NOX) are purified by oxidization and deoxidization while passing through the catalytic converter.
― Oxidization process
• Noxious HC (hydrocarbon) and CO (carbon monoxide) are bonded to oxygen which is converted to non-noxious carbon dioxide and water.
O2+ HC + CO → CO2+ H2O
― Deoxidization process
• Noxious NOX (nitrogen oxide) is converted to non-noxious nitrogen and oxygen. A part of the oxygen generated at this time is used in the oxidization process.