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Which structure does a diesel particulate filter use?

  • A.A wall flow monolith with alternately plugged channels
  • B.A flow through monolith, whose open channels are coated with a catalyst that oxidises the soot as it passes
  • C.A paper element
  • D.A ceramic honeycomb whose channels are blocked at alternate ends, forcing the gas through the porous walls

Answer: A

Plugging alternate ends forces the gas through the porous walls, which trap the soot. The last option describes exactly that construction, which makes it a correct and more detailed version. Flow through filters exist but trap far less. The order in which the effects act is what decides the outcome, so it is worth establishing first. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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