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Which after treatment addresses methane slip?

  • A.A catalyst formulated for methane, which is far harder to oxidise than the longer hydrocarbons of petrol
  • B.A methane oxidation catalyst
  • C.A three way catalyst, which oxidises the methane in the same manner as any other hydrocarbon present
  • D.Nothing

Answer: B

Methane is unusually stable and needs a dedicated catalyst formulation. The last option explains exactly that difficulty, which makes it a correct and more instructive version of the same answer. Checking which component actually carries the load settles most questions of this kind at once. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

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