Some petrolheads see them as a nuisance, but cats catalytic converter are a vital component for your vehicle’s emissions control
A war on emissions has been raging for the best part of 40 years, with governments coming down hard on the automotive industry. In the 1970s, the US government enforced a law that stated every car manufactured from that year onward had to be fitted with a device called a catalytic converter.
This device soon spread throughout the world of cars and has now become a staple of emissions control and is integrated into virtually every modern exhaust system.
The cat sits around a third of the way down the exhaust system and resembles a small metal chamber that receives exhaust gasses and changes the chemical nature of them to reduce the volume of nasty emissions fresh from the exhaust manifold. Within the cat housing is a ceramic-based honeycomb structure that is lined with extremely precious metals, with each metal having a specific job in emission-reduction.
There are three main emissions produced by car engines: nitrogen gas (N2), carbon dioxide (CO2) and water vapour (H2O). The catalytic converter however is mostly used to tackle the smaller, more-harmful products that are produced due to the naturally-imperfect combustion process of the IC engine. These are carbon monoxide, hydrocarbons and nitrogen oxides. Most cats these days are therefore called three-way catalytic converter due to the three main types of emission that they manage to tackle.