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3-Way Catalytic Converter

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The 3-way Catalytic (TWC) converter contains either Platinum (Pt) and Rhodium (Rh), or Palladium (Pd) and Rhodium (Rh). TWC converter catalyzes oxidation reactions of unburned HCs and CO and reduction reaction of NOx. The 3-way conversion can be best accomplished by always operating engine air fuel/ratio at or close to stoichiometry (14.7:1). For additional stoichiometry information, see 3-WAY CATALYST CONVERSION EFFICIENCY .

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