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What is the difference between a catalytic converter and a Diesel Particulate Filter ?

mods We all know that cars are major contributors to air pollution through the emission of gases. (See article about air quality standards here.) This then causes global warming, which affects the environment, but thanks to the catalytic converter and the diesel particulate filter, which helps in reducing the impact of air pollution. Both of them have a ceramic or metallic element that gases from the vehicle pass through.

Although both of them help reduce air pollution, they have some common differences that you may need to know before deciding which one to use. Please keep reading to find out how both devices work and what are their common differences.

Catalytic Converter

This is a device that is bolted to the underside of your car. It has two pipes that help in the emission of exhaust gas from the internal of your vehicle. The device uses a catalyst to convert harmful compounds into harmless compounds, some of which include carbon monoxide, hydrocarbons, and nitrogen oxides.

The catalyst components in the device that help neutralize the harmful compounds are usually platinum, palladium, and rhodium, and they are all heat resistant. This device converts the gases into;

  • Carbon dioxide
  • Water
  • Nitrogen
  • And Oxygen

What Does a Catalytic Converter Do

The converter is a fantastic device with several parts and functions that aids in the emission of clean air. The device is chamber-like and contains porous. It is also made up of stainless steel material for durability. Others include a ceramic monolith, an expanding mat, and a lambda probe that measures the exhaust gas’s oxygen content.

So how does it work? The dirty air is passed into the insulated stainless-steel case. It then flows into the catalyst on the honeycomb ceramic structure, where it is purified. Finally, the clean air passes to the tall pipe and then released into the atmosphere.

Diesel Particulate Filter

The device is equipped with tiny channels used to trap soot and ash from the exhaust gas. It removes black smoke from the engine exhaust, and it is excellent for the environment. The device is also used in different industries such as Petro-chemistry and medicine manufacture.

The dpf is made of cordierite or silicon and has some flow wall features that help in cleaning gas. They include;

  • Low backpressure
  • High filtration capacity about 95%
  • Broadband filtration
  • High refractory

How Does dpf Work

You may be wondering what a catalytic converter does that is different from a dpf. The device adopts the honeycombs structure, which it uses to trap carbon particulates from the exhaust gas. The particulates are usually left behind on the passage wall, and it is then later burned off during the filter regeneration process that occurs after every 300 kilometers.

One of the main dpf problems is the clogging of the filters. This normally happens if you mostly travel for short trips or leave your engine to ideal for a long time. To eliminate all the particulate matter, you must operate at 400 degrees Celsius, or you can take your car to a shop for forced regeneration. These problems occur even if you have a well-maintained or serviced vehicle. You should seek help from professionals before you cut it open and gut it.

Difference Between a Catalytic Converter and a Diesel Particulate Filter

As we have seen earlier, both devices are used for cleaning the exhaust gases coming from vehicles. The main difference between the two is the way it collects the particles during the emission of air. The cat converter keeps most harmful substances from entering the atmosphere and doesn’t filter out particles. When it comes to this filter, it prevents large particles and black smoke from entering the atmosphere.

Another difference between the two devices is the catalysts equipped in each device. Although the filter cleans the harmful substances, it is not as efficient as the cat converter. This is because the CAT is meant for cleaning the toxic substances while the dpf is for trapping large particles like soot. Another reason is that dpf cars use diesel, which does not emit many hydrocarbons into the atmosphere, unlike cars that use petrol.

Both devices perform well, and it only depends on which type of car you own or want to purchase. Mostly diesel cars use dpf, while gasoline cars use CAT, and Krosfou UK offers both of these devices if you need to replace or buy one for your car.


When purchasing a vehicle, you should consider checking which device it uses. This is because of the maintenance cost, which is always very expensive. To know that your device needs maintenance, you should check for these symptoms; dark smoke exhaustion, reduced acceleration, too much heat under the vehicle, or sluggish engine.

Additionally, it is essential to check and clean your vehicle frequently to avoid extreme clogging of the filters. If you consider buying one of these devices for your car, this article is meant to help you make an informed decision on which will best suit your needs.


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