Method of reducing NOx in diesel engine exhaust

Details Method of reducing NOx in diesel engine exhaust Method of reducing NOx in diesel engine exhaust

2006-08-15

2006-08-15

Cooke, Colleen P. (Department: 1754)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

C423S212000, C060S275000

Reexamination Certificate

active

07090811

ABSTRACT:
This invention provides a method of reducing nitrogen oxides in an oxygen containing exhaust stream using ethanol as a reductant for plasma-assisted selective catalytic reduction. The exhaust gas, generated from a diesel engine or other lean-burn power source, comprises nitrogen oxides, especially NO. Ozone generated from a plasma reactor is injected into the exhaust stream to convert NO to NO2and the plasma injection is followed by the addition of ethanol. The NO2is then reduced by contacting the exhaust stream with a dual-bed catalytic reactor comprising BaY (or NaY) and CuY zeolite catalysts in the presence of ethanol as the reductant. The plasma power density and the molar ratio of ethanol to NOx fed to the catalytic reactor are controlled as a function of the catalyst temperature for the best performance of the plasma-catalyst system. An average conversion of NOxto N2of at least 90% is achieved over the temperature range of 200–400° C.

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