NO2 from Lean-Burn Engines - On its Lower Sensitivity to Leaning than NO
Copyright policy )NO2 from Lean-Burn Engines - On its Lower Sensitivity to Leaning than NO
<div class="htmlview paragraph">Investigations on the NO<sub>x</sub> reduction for natural-gas-fueled spark-ignition engines with lean-burn techniques revealed that NO<sub>2</sub> is less sensitive to reduction measures than NO. For NO concentrations over 1000 ppm, the NO<sub>2</sub>/NO ratio is generally less than 0.1. For NO concentrations below 50 ppm, the NO<sub>2</sub>/NO ratio begins to exceed 1.0. The literature on burner and flow-reactor tests explains this phenomenon via the oxidation of NO with hydroperoxyl radicals through reactions very sensitive to component concentrations. Since NO is the precursor of NO<sub>2</sub>, measures to further lower the NO production will ultimately result in a lower NO<sub>2</sub> emission. This has been demonstrated experimentally with an engine.</div>
- Gasunie Netherlands
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