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Selective catalytic reduction removes nitrogen oxides by

  • A.Absorbing them in an alkaline scrubber
  • B.Adsorbing them on activated carbon
  • C.Condensing them at low temperature
  • D.Reacting them with ammonia over a catalyst

Answer: D

The catalyst allows the reaction to proceed at around three hundred to four hundred degrees with high selectivity. Ammonia slip and catalyst poisoning are the two operating concerns, and the catalyst itself is a substantial part of the cost.

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