4.14: Know that, In Car Engines, the Temperature Reached is High Enough to Allow Nitrogen and Oxygen from Air to React, Forming Oxides of Nitrogen

FORMATION OF OXIDES OF NITROGEN IN CAR ENGINES:

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• IfCombustion of fuels in car engines causes high temperatures to be reached, allowing Nitrogen and Oxygen from the Air to combine to produce Nitrogen Monoxide:

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Nitrogen   +   Oxygen   →   Nitrogen Monoxide

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• When Nitrogen Monoxide is released from the exhaust of car engines, it combines with Oxygen in the Air to form Nitrogen Dioxide:

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Nitrogen Monoxide   +   Oxygen   →   Nitrogen Dioxide

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• Hence, both Nitrogen Monoxide and Nitrogen Dioxide are produced in car engines - referred to as NOx