#
CATALYTIC CONVERTER SYSTEM [WITH WU-TWC]

id0116001014b0

## 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