Catalytic converter

Catalytic converter

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Credit: ALFRED PASIEKA/SCIENCE PHOTO LIBRARY

Caption: Catalytic converter. Part of a catalytic converter from a car exhaust. This device reduces the toxic emissions from an internal combustion engine. It does this by converting the harmful exhaust by- products into relatively harmless ones. The inner surface is coated with an alloy containing platinum, rhodium and palladium. Oxidation catalysts convert hydrocarbons into carbon dioxide and water. Three-way catalysts convert oxides of nitrogen back into nitrogen. The addition of a catalytic converter to a car necessitates the use of unleaded fuel since the lead compounds added to regular petrol as anti-knocking agents can destroy the catalyst.

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Keywords: air pollution, car exhaust, catalysis, catalyst, catalytic converter, chemical, chemistry, environment, environmentally-friendly, internal combustion engine, smog

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