CATALYTIC CONVERTER [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)]

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Purpose, Function

•  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.
WU-TWC
―  The three-way catalyst is integrated with the exhaust manifold.
―  Because the catalyst receives the high temperature exhaust gas just after the gas is exhausted, it activates quickly and achieves an improved purification performance.
TWC
―  A single-nano catalyst has been adopted in which the purification performance can be maintained using less precious metal materials than conventional catalysts.

Construction


WU-TWC

•  The WU-TWC is installed to the rear of the engine.
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•  The WU-TWC is integrated with the exhaust manifold.


TWC

•  The TWC is installed to the rear of the 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