CATALYTIC CONVERTER SYSTEM [WITH WU-TWC]


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Outline

• Purifies contaminants in the exhaust gas by utilizing a chemical reaction in a three way catalytic converter.

Structure

• Consists of a three way catalytic converter and insulator.
• A catalytic converter utilizing a platinum-palladium-rhodium system has been adopted.
System diagram

Operation

• 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.
NOX → N2 + O2