• The WU-TWC is integrated with the exhaust manifold.
TWC
• The catalytic converter (TWC) is located behind the catalytic converter (WU-TWC).
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Operation
• Contaminants in the exhaust gas (HC, CO, NOx) are purified by oxidization and deoxidization while they are passing through the catalytic converter.
― Oxidization process
• Noxious hydrocarbon (HC) and carbon monoxide (CO) are bound with oxygen and converted to non-noxious carbon dioxide and water. O
2+HC+CO→CO
2+H
2O
― Deoxidization process
• Noxious nitrogen oxide (NOx) is converted to non-noxious nitrogen and oxygen. A part of the oxygen generated in this process is used in the oxidization process. NOx→N
2+O
2