Reduction of nitrogen oxides with carbon monoxide

Reduction of nitrogen oxides with carbon monoxide 

Reduction of nitric oxide by carbon monoxide was first reported to occur at low temperature (252-369 K) over gold powder (0.86 m2 g-1) 30 the rate was maximal at 314 K, and nitric oxide inhibited the reaction. This paper also provides an early indication of the activity of gold for the oxidation of carbon monoxide near ambient temperature. Nitric oxide reduction occurs in this way in catalytic converters for the treatment of engine exhaust gases 9 

Although there are some differences in the literature concerning the relative activities of the platinum group metals for this reaction, the most likely sequence is Rh Pd Pt.9 Over AU/AI2O3, the reduction of nitric oxide in the absence of oxygen occurs as low as 323 K, producing nitrous oxide  

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