Discussion
Low sulphur diesel is required for modern aftertreatment because sulphur
Answer: D
Correct answer: Poisons catalysts and forms sulphate particulate
Sulphur attacks aftertreatment twice over. It adsorbs onto the precious metal sites and suppresses catalytic activity, and it is oxidised to sulphate which condenses and is weighed as particulate.
Both effects made low sulphur fuel a precondition rather than a refinement: particulate filters and reduction catalysts could not be introduced until the fuel supply was cleaned up, which is why sulphur limits and emission standards advanced in step. It does not affect atomisation or cetane appreciably.
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