CATALYTIC CONVERTER [SKYACTIV-G 1.3, SKYACTIV-G 1.5]

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Purpose, Function

•  The catalytic converter purifies contaminants in the exhaust gas by utilizing the chemical reactions of the three-way catalytic converter.
•  A WU-TWC and a TWC have been adopted.

Construction


WU-TWC

•  The catalytic converter (WU-TWC) is located behind the engine.

SKYACTIV-G 1.3, SKYACTIV-G 1.5 (with 4-1 exhaust system)

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SKYACTIV-G 1.5 (with 4-2-1 exhaust system)

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•  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.
O2+HC+CO→CO2+H2O
―  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→N2+O2