A catalytic converter employs this principle and uses catalyst substances to clean up harmful gas substances from the engine before they exit the exhaust pipe to the atmosphere.
A catalytic converter generally looks like an exhaust silencer, only smaller and slimmer.
In modern cars, ‘cats’ are normally placed right up next to the engine so they’ll warm up quicker.
They are much more efficient at higher temperatures, which is why it makes sense for them to be located close to the engine where the temperature is very higher.
Since the late 2000’s the use of DPF’s (Diesel Particulate Filters) have been introduced into the diesel world as a form of a new and advanced catalytic converter. With diesel engines generally being known for dirtier burn residue than gas engines, there was a problem. Many of you have been driving and have seen that black smoke billowing out of an old dump truck or tractor-trailer on the roadside, many auto and truck makers started to do something to change it with something more eco-friendly.
New laws helping in cut down of greenhouse emissions also had something to do with it. These new Diesel Particulate Filters have been able to reduce and cut down on the black smoke emissions and be able to help diesel trucks, buses, vans, and other cars exhaust burn much cleaner, more efficient, and have created a new category of catalytic converters for scrap too.