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A method for quantitative analysis of nitrogen oxides and N2 by means of mass spectrometry with the assistance of a catalytic technique for the reduction of NO with CO or hydrocarbons

Mass spectrometry is not able to differentiate NO x and N2 from other interferences (e.g. CO and C2H4) in the deNO x reactions. In the present study, a quantitative method for analysis of NO x and N2 simultaneously in these reactions with an assisted converter operated at higher temperature under O2-rich condition, which eliminates the interferences, is developed. The NO x conversion from this method is comparable to the one from an Automotive Emission Analyser equipped with NO x electrochemical sensor. Two types of deNO x reactions are tested in terms of selectivity of N2 production. The application of this method is discussed.