Re: Ammonia ?
Ammonia is used downstream of the engine to reduce NOx emissions. By itself, ammonia has no effect on CO in the exhaust, although the de-NOx catalyst may be oxidizing CO at the same time.
Urea (NH2CONH2), by the way, is simply two ammonia (NH3) molecules joined to a carbon dioxide (CO2) molecule, less a water (H2O) molecule. Add water, and you get the ammonia back.
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