Discussion
Statement I: Fuel sulphur reduction was a precondition for modern diesel aftertreatment.
Statement II: Sulphur poisons catalysts and is oxidised to sulphate that adds to measured particulate.
In the light of the above statements, choose the correct answer.
Answer: A
Correct answer: Both Statement I and Statement II are correct
Both are true and the second gives both mechanisms. Sulphur adsorbs onto catalyst sites and suppresses their activity, and it is oxidised to sulphate that condenses and is weighed as particulate.
Filters and reduction catalysts therefore could not be introduced until fuel sulphur had been reduced by a factor of tens, which is why the refinery investment and the emission standards were sequenced together. Cleaning the fuel was a precondition rather than a parallel improvement.
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