Sorry, but Robert is not right.
the catalytic converter makes certain reactions go faster. Many of those involve the reduction of nitrogen oxides, either NO or NO2. But a reducing agent is needed, and it is usually CO, HC (unburnt fuel) or H2 formed in small amounts in the complex reactions.
Unfortunately the catalyst does NOT catalyze the decomposition of NOx, only its reduction.
That is one of the reasons why the fuel to air ratio is so carefully controlled, so that you have enough reductants to do the reactions but not so much that they also pollute.
Does that help?Catalytic converter?
Yes.
They complex platinum/rhodium (sometimes with palladium) catalyst will reduce the NO2 (or any oxides of nitrogen) produced regardless of whether there is any other material that needs to be oxidised.
2NO2 -------%26gt; N2 + 2O2
Generally 2NOx ---%26gt; N2 + xO2
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