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Discussion

Selective non-catalytic reduction differs from the catalytic route in that it

  • A.Works at furnace temperature without a catalyst
  • B.Achieves higher removal efficiency
  • C.Uses no reagent at all
  • D.Operates at ambient temperature

Answer: A

Ammonia or urea is injected into a narrow temperature window of about eight hundred and fifty to eleven hundred degrees. Removal is typically thirty to fifty per cent, against eighty or ninety for the catalytic route, but capital cost is far lower.

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