Further Studies on the Oxidation of Nitric Oxide; the Rate of the Reaction between Carbon Monoxide and Nitrogen Dioxide

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Abstract
The initial rate of the reaction between CO and NO2 from 225°C to 290°C was measured under conditions which precluded the possibility of NO2 decomposition. This study extends the earlier data on the reaction over a 300° temperature interval. The oxidation of nitric oxide at 25°C and at pressures from 0.01 to 0.1 mm of NO was found to be third order over a 3‐ and 6‐fold change in reactants. The CO2 and NO2 production in systems containing NO, CO, and O2 around 150°C was measured under conditions in which the formation of CO2 by the reaction between CO and NO2 was negligible. It is concluded that NO3 is the intermediate needed to correlate this and previous data on reactions involving NO and NO2, and that the rate of the reaction of NO3 with NO is faster than that with CO. A new apparatus containing greaseless valves capable of handling quantities of products of the order of 10—3 mm, and a method of analysis precise to 3×10—5 mm was devised. Methods to prepare reactant gases of the requisite purity are described.