NOx Reduction and the Chemistry of SCR
NOx is a general term referring to Nitrogen Oxide (NO) gas and Nitrogen Dioxide (NO2 ) gas. It forms at the high temperatures of the engine combustion process.
NOx is successfully converted to Nitrogen gas (N2) using Selective Catalytic Reduction, or SCR, the most effective technology available today.
SCR works by promoting a chemical reaction between NOx and ammonia gas (NH3). The ammonia comes from a reductant fluid such as aqueous urea solution, that is injected into the exhaust stream ahead of the SCR catalys
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