FIELD: chemistry.
SUBSTANCE: cleaning method in which the reduction of nitrogen oxide occurs owing to the fact that the waste gas stream upstream of the catalyst, which is filled with a catalyst material for selective catalytic reduction of nitrogen oxide, ammonia releasing reducing agent is added, characterized in that the ratio of NH3 to NOx (load factor α) periodically varies by changing the raw output of nitrogen oxides from a combustion engine so that the load factor α periodically fluctuates around the set value.
EFFECT: ability to change the amount of ammonia present in the catalyst, giving at the same time by increasing the amount of reductant.
11 cl, 4 dwg
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