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Universal Catalytic Converters


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Universal Catalytic Converters

Catalytic converters change harmful substances in a car’s exhaust gasses, such as carbon monoxide, nitric oxide, nitrogen dioxide, and hydrocarbons, into less harmful substances like carbon dioxide and water vapor by means of chemical reactions.

The interior of the ‘cat’ is usually filled with a honeycomb structure onto which a coating is applied that contains a catalyst - the substance that creates a reaction with the exhaust gasses, changing their chemical structure. 

Precious metals like palladium, rhodium, and platinum are commonly used as a catalyst and these have an intrinsic value that means they’re worth salvaging and recycling when the car is scrapped. Unfortunately, these precious metals also make catalytic converters a target for thieves. 

Types of catalytic converters

There are various types of catalytic converters. A simple ‘two-way’ oxidation cat works to turn carbon monoxide (CO) to carbon dioxide (CO2) and hydrocarbons, which are basically particles of unburnt fuel, to carbon dioxide and water.  More advanced ‘three-way’ catalytic converters are fitted to modern cars and these do the above while also reducing emissions of nitric oxide (NO) and nitrogen dioxide (NO2) which together are more commonly known as NOx, a major cause of localized air pollution.

Diesel cars typically have special catalytic converters to cope with the specific emissions from compression ignition diesel engines. These Diesel Oxidation Catalyst units are routinely paired with additional exhaust treatment technologies such as exhaust gas recirculation, Diesel Particulate Filters to trap soot, and Selective Catalytic Reduction which uses injections of AdBlue urea solution to remove NOx. 

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