A catalytic converter (see diagram) is placed in the exhaust system (1) to reduce the pollution produced by combustion engines (2). It comprises a ceramic honeycomb structure (3), which maximizes the surface area of the converter, covered in catalysts – normally platinum and rhodium (4). As exhaust gases, primarily carbon monoxide, nitric oxide, and hydrocarbons from the cylinder, pass through the converter they react with the catalysts. The platinum and rhodium accelerate oxidation and reduction in the hot gases. The pollutants are oxidized into water, carbon dioxide, and nitrogen.
Related category TECHNOLOGY
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