As you know, the catalyst is one part of the exhaust system. It can be mounted inside the exhaust manifold or directly under the car, depending on the age and model of the car. The catalytic converter is currently available on both petrol and compression ignition (diesel) engines. Although of a different type, they play the same role.
Catalyst, is the part of the exhaust system responsible for the removal of harmful substances from the exhaust gas. The catalytic converter has been installed in petrol-powered cars for many years. Recently, due to strict exhaust emission standards, they are also used in cars with compression ignition engines (diesel engines). In older car types, the catalytic converters were installed under the floor panel, and in newer models, they are in the exhaust manifolds to increase their efficiency.
The catalytic converters under the car are characterized by a small metal plate connected to the middle and rear muffler, the exhaust pipe. It is easy to remove because a worn-out catalyst can be added or removed and replaced with a new one.
Catalysts installed in the exhaust manifold are more difficult to find and replace. The manifold is one large part, one of which is the catalyst itself. Catalyst replacement involves the removal of the entire manifold, the cutting of the converter, the replacement of the liner, and finally the welding of the catalyst. The question is: why do most new cars use collectors? Because the built-in inverter can heat up faster and therefore work better
A slightly different situation is seen when we look at diesel-powered cars. In this type of car, the catalysts are under particulate filters (called DPFs). At this point, the exhaust gas first passes through the particulate filter and only then is it routed to the converter. It is worth noting that sometimes both of these parts are mounted in one housing (similar to a metal can) rather than in one.