Diesel oxidation catalysts (DOC) are used to reduce hydrocarbon (HC) and carbon monoxide (CO) emissions. HJS has been using this technology since the early 1990s.
In addition, there are numerous applications in which the DOC is used to oxidize nitrogen monoxide (NO) to nitrogen dioxide (NO2).
On the catalytically active surface of the DOC, CO and HC are converted to carbon dioxide (CO2) and water (H2O) with the help of oxygen (O2), which is usually present in excess. The DOC usually contains precious metals such as platinum (Pt) or palladium (Pd) as active components.
In combination with a particulate filter, the DOC is also used for passive regeneration of the particulate filter. For this purpose, the DOC first converts the nitrogen monoxide (NO) present in the exhaust gas into nitrogen dioxide (NO2), which is then used in the downstream particulate filter to oxidize the separated soot (C) toCO2.
In combination with an SCR system to reduce nitrogen oxides (NOx), the DOC can be used to improve NOx reduction in the lower temperature range. For this purpose, up to 50 % of the NO contained in the exhaust gas is first oxidized to NO2. The resulting mixture of NO and NO2 is then very effectively reduced to nitrogen (N2) and water (H2O) in the downstream SCR catalytic converter.
HJS has developed a technology especially suitable for coating the HJS Sintered Metal Filter (SMF®), which supports the passive regeneration of the SMF®.
Diesel oxidation catalysts are used in almost all exhaust gas aftertreatment systems. The fields of application range from passenger cars and commercial vehicles to the non-road market and stationary engines.
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