FIELD: chemistry.
SUBSTANCE: in the exhaust gas stream that enters the NO (5) oxidation catalyst, the concentration of the reducing agent is changed and the resulting NOx change is determined in the exhaust gas stream within the NO (5) oxidation catalyst and/or after the NO (5) oxidation catalyst and is evaluated to check the performance of the catalyst.
EFFECT: increasing the degree of purification.
19 cl, 2 dwg
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