What does a diesel oxidation catalyst reduce?

Diesel Oxidation Catalysts (DOC) are catalytic converters designed specifically for diesel engines and equipment to reduce Carbon Monoxide (CO), Hydrocarbons (HC) and Particulate Matter (PM) emissions. DOC’s are simple, inexpensive, maintenance-free and suitable for all types and applications of diesel engines.

Does Doc reduce NOx?

In aftertreatment systems with SCR catalysts and particulate filters, the DOC is used to increase the NO2/NOx ratio and to oxidize HCs and increase the exhaust gas temperature to support active DPF regeneration.

Can a diesel oxidation catalyst be cleaned?

In general, cleaning requires removing the DOC from the vehicle, heating it, and using compressed air combined with a vacuum system to blow out the ash and capture it in a sealed container. Professional cleaning services are available.

How does a diesel oxidation catalyst work?

Abstract: Diesel oxidation catalysts promote chemical oxidation of CO and HC as well as the organic fraction (OF) of diesel particulates. They also oxidize sulfur dioxide which is present in diesel exhaust from the combustion of sulfur containing fuels.

Does a catalytic converter reduce NOx?

Catalytic converters use reduction and oxidation (redox) reactions to reduce harmful emissions. They use a reduction catalyst composed of platinum and rhodium. It helps reduce nitrogen oxides (NOx) by removing nitrogen atoms from nitrogen oxide molecules (NO and NO2). This lets the free oxygen form oxygen gas (O2).

What is ammonia slip catalyst?

An exhaust system operating with an SCR catalyst is usually also equipped with a special catalyst providing a selective Ammonia (NH3) oxidation function. Due to the dynamic driving cycle, recognizable amounts of NH3 leave the SCR.

How many times can a DPF be cleaned?

Generally, it’s recommended that a DPF be cleaned roughly every 150,000-200,000 miles. At this point, ash in the filter cells begins to harden. This hardening can cause the filter to crack, resulting in permanent damage.

How many miles should a DPF last?

around 100,000 miles
A DPF can last up to around 100,000 miles if maintained properly. After the car has exceeded that mileage, you could be looking at paying a large amount of money for a replacement – so always properly check MoT and service records when buying a used car.

Can you clean a SCR catalyst?

SCR catalyst systems need to be cleaned to remove contaminants and plugs. If the catalyst is not kept clean and the ammonia injection system is not tuned, ammonia slip occurs.

Which comes first SCR or DPF?

Selective Catalytic Reduction is a separate component from the DPF in most applications, at least functionally if not physically. SCR is used to reduce Nitrogen (Di) oxide emissions from diesel engines which is again harmful.

How effective is a catalytic converter?

By most estimates, catalytic converters fitted inside the exhaust pipe of a gasoline-operated car convert over 90% of hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOx) from the engine into less harmful carbon dioxide (CO2), nitrogen and water vapour.