Technologies that cut nitrogen oxides and other exhaust pollutants, including selective catalytic and non-catalytic reduction, catalytic converters and crankcase ventilation systems. A technology belongs here when its cited article describes such an exhaust or NOx control. These technologies reduce nitrogen oxides and other pollutants in exhaust by chemical conversion, using catalysts or injected reagents, or by handling crankcase gases. A technology is placed here by the exhaust control method the cited article describes.
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Nitrogen Oxide and Vehicle Exhaust Control
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Wikipedia: Selective catalytic reduction
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Selective catalytic reduction (SCR) means converting nitrogen oxides, also referred to as NOx with the aid of a catalyst into diatomic nitrogen (N2), and water (H2O).
Wikipedia: Selective non-catalytic reduction
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Selective non-catalytic reduction (SNCR) is a method to lessen nitrogen oxide (NOx) emissions downstream of a combustion process.
Wikipedia: Catalytic converter
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A catalytic converter is an exhaust emission control device which converts toxic gases and pollutants in exhaust gas from an internal combustion engine into less-toxic pollutants by catalyzing a redox reaction.
Crankcase ventilation system, Wikipedia
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A crankcase ventilation system (CVS) removes unwanted gases from the crankcase of an internal combustion engine.
Wikipedia: Exhaust gas recirculation
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In internal combustion engines, exhaust gas recirculation (EGR) is a nitrogen oxide (NOx) emissions reduction technique used in petrol/gasoline, diesel engines and some hydrogen engines.
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