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ECN publication
Combined catalytic removal of N2O and NOx from the tail gases of a nitric acid plant
Published by: Publication date:
ECN 1-4-2001
ECN report number: Document type:
ECN-RX--01-012 Conference Paper
Number of pages: Full text:
15 Download PDF  

Presented at: NOXCONF 2001. International Conference on Industrial Atmospheric Pollution. NOx and N2O control : panel of available techniques, Paris la Défense, France, 21-22 maart 2001.

Nitrous oxide (N2O) is a greenhouse gas with a high global warming potential. The nitric acid industry is a major source of N2O. ECN developed a technique for the catalytic removal of N2O from the tail gases of a nitric acid plant. The most cost effective method for N2O abatement is direct decomposition (0.3 to 1 EUR/ton CO2 equivalents removed). However, this techique can only be used when the tail gas temperature is higher than 400 degrees C. Selective catalytic reduction (SCR) of N2O with LPG can be used in plants with a tail gas temperature below 400 degrees C. The use of a reductant makes this method more expensive; the cost is 1.3 to 2 EUR/ton CO2 equivalents removed. Combination of N2O removal with the destruction of N)x in a single reactor is an opportunity to improve the overall cost effectiveness.

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