METHOD OF REDUCING NITROGEN DIOXIDE EMISSION IN INTERNAL COMBUSTION ENGINE CAR RUNNING ON DILUTED MIXTURES Russian patent published in 2012 - IPC F01N3/08 

FIELD: chemistry.

SUBSTANCE: in a selective catalytic reduction catalyst (5), which contains adsorption centres for nitrogen oxides, at higher than the operating temperature, ammonia-saturated exhaust gases are fed onto the selective catalytic reduction catalyst (5). At lower than the operating temperature, exhaust gases fed onto the selective catalytic reduction catalyst (5) are saturated with a substance which slows down adsorption of nitrogen oxides on corresponding adsorption centres of the selective catalytic reduction catalyst (5). To reduce total NO_x emission to less than the given first value, ammonia-saturated exhaust gases are fed onto the selective catalytic reduction catalyst (5), and the content of NO₂ in the total emission of NO_x falls to a value lower than the given first value owing to that NO₂ is converted by hydrocarbons accumulated in the selective catalytic reduction catalyst (5).

EFFECT: reduced emission of nitrogen dioxide by an internal combustion engine in a wide operating range at critically low temperatures of exhaust gases.

16 cl, 1 dwg