Oxygen and nitrogen in the air supplied to a combustion process can react at sufficient rates at high temperatures

Oxygen and nitrogen in the air supplied to a combustion process can react at sufficient rates at high temperatures. The extent of the reaction is small but the presence of even small amounts of the various oxides of nitrogen in combustion products is an important factor from an air pollution perspective. Consider a mixture consisting of the following basic products of combustion: 11% CO2, 12% H2O, 4% O2 and 73% N2 (on a molar basis). At the high temperatures and pressures occurring within the cylinder of an engine, both NO and NO2 may form. It is likely that carbon monoxide will also be formed. Prepare plots showing the equilibrium moles fractions of CO, NO and NO2 as a function of pressure for pressures between 5 atm and 15 atm at 2000 K.


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