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It's a method for converting NOx gases to N2 and H2O with the help of a catalyst and using usually ammonia as a reducing agent.

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Depends on what emissions standards it's compliant with. If you have an EPA2010 or Euro6 compliant engine, water is just a byproduct of the Selective Catalytic Reduction system.


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Give mechanism for the reduction of NO2 to NH2.?

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