High Quality Content by WIKIPEDIA articles! A NOx Absorber is designed to reduce oxides of nitrogen emitted in the exhaust gas of a lean burn internal combustion engine. Lean burn (diesel) engines present a special challenge to emission control system designers because of the relatively high levels of O2 (atmospheric oxygen) in the exhaust gas stream. The 3-Way Catalytic Converter technology that has been successfully used on Rich Burn Internal Combustion Engines (typically fueled by petrol but also sometimes fueled by LPG, CNG, or Ethanol) since the middle 1980s will not function at O2 levels in excess of 1.0%, and does not function well at levels above 0.5%. Because of the increasing need to limit NOx emissions from Diesel engines technologies such as Exhaust gas recirculation (EGR) and Selective catalytic reduction (SCR) have been used, however EGR is limited in its effectiveness and SCR requires a reductant, and if the reductant tank is emptied the SCR system ceases to function.

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