2016 – MX-5 – Engine

CATALYTIC CONVERTER [SKYACTIV-G 2.0]

Purpose, Function

• The catalytic converter purifies contaminants in the exhaust gas by utilizing the chemical reactions of the three-way catalytic converter.

• Exhaust gas is purified directly after engine start by the warm-up three-way catalyst (WU-TWC) and three-way catalyst (TWC).

Construction

WU-TWC

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

  

• The catalytic converter (WU-TWC) is integrated with the exhaust manifold.

TWC

• The catalytic converter (TWC) is located under the floor of the vehicle.

  

Operation

• Contaminants in the exhaust gas (HC, CO, NOx) are purified by oxidization and reducing action while they are passing through the catalytic converter.

• Oxidization process

• Noxious hydrocarbon (HC) and carbon monoxide (CO) are bound with oxygen and converted to carbon dioxide and water.

  O₂+HC+CO→CO₂+H₂O

• Reduction action

• 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

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