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Selective catalytic reduction on a heavy diesel vehicle uses

  • A.A particulate filter
  • B.An aqueous urea solution
  • C.Ammonia gas stored under pressure
  • D.Recirculated exhaust gas

Answer: B

The urea decomposes to ammonia in the hot exhaust and the catalyst then reduces the oxides to nitrogen and water. Carrying a second consumable is the price of allowing the engine itself to be tuned for efficiency rather than for low emissions.

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