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Abstract: Particle oxidation catalysts (POC) are specialized diesel oxidation catalysts that utilize substrates with some capacity to capture solid particulates. The captured soot is then oxidized through reactions with nitrogen dioxide. POCs are passive devices, with PM emission reduction efficiency higher than that of the DOC, but lower than diesel particulate filters. Particle oxidation catalysts are a relatively new emission control technology—some aspects of their performance remain not fully characterized.
Definition. Particle oxidation catalysts (POC) are devices that can capture and store carbonaceous PM material for a period of time sufficient for its catalytic oxidation, while having open flow-through passages that allow exhaust gases to flow, even if the PM holding capacity is saturated. In other words, the particle oxidation catalyst is a specialized diesel oxidation catalyst with a capacity to hold solid soot particles. The captured particles must be removed from the device through oxidation to gaseous products, in a process called regeneration. The POC regeneration is typically accomplished via reactions between soot and nitrogen dioxide, generated in an upstream NO2 catalyst. Contrary to the diesel particulate filter (DPF), the POC will not plug once filled with soot to its maximum capacity in the absence of regeneration. Rather, the PM conversion efficiency will gradually decrease, allowing the PM emissions to pass through the structure.
Particle oxidation catalysts—a relatively new PM emission control technology—have a particulate control efficiency higher than that of the DOC, but lower than diesel particulate filters. These devices may use different types of substrates, and are known by several names, including:
- Flow-through filters (FTF)
- Open particulate filters
- Partial flow filters
- Partial filter technology (PFT)
- PM oxidation catalysts
- PM filter catalysts
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