Selective non-catalytic reduction (SNCR) is a post-combustion process for reducing nitrogen oxides (NOx) emissions by injecting a chemical reductant—commonly ammonia, urea or hydrocarbon ...
Selective catalytic reduction (SCR) systems employing a urea-water solution inject a measured dose of aqueous urea into exhaust gases, where thermal decomposition and hydrolysis generate ammonia. This ...
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