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Catalytic Converters - Catalytic Converter - Discount Catalytic Converters
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The catalytic converter is an integral part of the exhaust system. There are two types of catalytic converter: the three-way which refers to the reduction of nitrogen oxides, oxidation of carbon monoxide, and oxidation of unburnt carcinogenic hydrocarbons, and the two-way catalytic converter which has two simultaneous tasks of oxidation of carbon monoxide and oxidation of the hydrocarbons and was widely used on all engines in the US until 1981 when the regulation changed to include the control on NOx emissions. A catalytic converter has several components like the core or substrate made of ceramic honeycomb whose function is to support the catalyst, the washcoat, which is a mixture of silicon and aluminum which is added to the core to give a larger surface area, and lastly, the catalyst, which is most often made of precious metal. Platinum and rhodium are used as a reduction catalyst, while platinum and palladium are used as an oxidization catalyst.
Catalytic converters can suffer from catalyst poisoning and become ineffective in the presence of lead. Some conditions like a crack in the valves, oil in the exhaust system or ignition failure all of which can cause the catalytic converter to overheat and meltdown.
