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Oxidising Catalytic Converter

Emissions from diesel engines cannot be treated with the three-way catalytic converter because they operate with excess air. The use of a lambda control system is ruled out for technical reasons.
An oxidising catalytic converter is used to convert the combustion pollutants hydrocarbon (HC) and carbon monoxide (CO) into the harmless substances carbon dioxide (CO2) and water (H2O) by oxidation and reduction.