![]() Nitrous oxide (N 2O), also known as 'laughing gas'. Internal combustion engines can produce all three nitrogen oxides. These chemicals react with the NOx gases and removes them.Ī. On an industrial scale, exhaust gases can be scrubbed with chemicals such as sodium hydroxide, hydrogen peroxide, or a mixture of hydrogen peroxide and nitric acid.Urea or ammonia is injected, and the NOx gases are reduced to nitrogen without the need for a catalyst. Selective Non-Catalytic Reduction (SNCR) – takes place in ducting where the temperature is about 1000☌ (1800☏). ![]() These react with NOx gases over a catalyst, which turns them into harmless nitrogen and water. There are various proprietary blends of ammonia and urea which can be injected into the exhaust flow.
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