Inhibition of atmospheric photooxidation of hydrocarbons by nitric oxide

Effects of hydrocarbon and nitrogen oxides on photochemical smog formation

“…propylene and xylene and the relatively unreactive toluene and butane. Similar data were also reported by Glasson and Tuesday (1970). These reported data show that the dependence of oxidant on NOz does show a maximum; however, the same data also seem to support the generalization that this oxidant maximum occurs at lower NOz levels for less reactive hc :NOz systems.…”

Effect of Hydrocarbon and NOxon Photochemical Smog Formation under Simulated Transport Conditions

“…The maximum O3 yield in- creases with initial NO* concentrations at low NO* values but decreases with increasing NO* concentrations at higher NO* values as observed previously by various investigators. 6 ' 7 The curves tend to flatten out as the hydrocarbon concentration increases, possibly reflecting the wide range of hydrocarbon reactivities in the surrogate mixture. The NO* concentration corresponding to the highest O3 value tends to decrease with decreasing initial hydrocarbon concentration.…”

An Evaluation of the Fuel Factor Through Direct Measurement of Photochemical Reactivity of Emissions

“…The weighting factors are the components' mole fractions, x, as determined from chromatographic analysis; the component reactivity values, r t -, represent rate-of-NO-photooxidation reactivities and are those established by Glasson and Tuesday. 9 Conclusions in this report regarding the relative effects of different fuel modifications are based wholly on rate-of-NO-photooxidation reactivity data obtained through direct experimental measurement. Linear summation reactivity data were generated and used in parallel, only for the purpose of demonstrating the extent to which the method of reactivity measurement may influence judgment upon the relative effectiveness of different fuel modifications in reducing levels of emission reactivity.…”