EffectsofHydrocarbontoOxidesofNitrogen RatiosonIrradiated Auto Exhaust,Part 1

Effects of hydrocarbon and nitrogen oxides on photochemical smog formation

“…Patterns that describe dependence of other reactivity manifestations on hc and NOz were generally in good agreement with those reported (Altshuller et al, 1969;Buchberg et al, 1963;Glasson and Tuesday, 1966;Korth et al, 1964;Altshuller etal., 1970;Stephens and Burleson, 1969). Within the range of initial concentration levels used in this research, these dependencies are as follows: At low NOz levels, the N02 dosage is nearly proportional to NOz and is slightly inhibited by hc at higher hc levels, the HCHO dosage is nearly propor-tional to hc level and slightly inhibited by NO,, and rate of NG2 formation is nearly proportional to hc and varies similarly with NOz in the lower NO, level range; at higher NO, levels, Rno, is nearly independent of NOz.…”

“…The role of hc and NOz in smog phenomena had been studied (Altshuller et al, 1969;Buchberg et al, 1963; Glasson and Tuesday, 1966;Romanovsky et al, 1967;Hamming and Dickinson, 1966;Korth et al, 1964;Nicksic et al, 1966); however, interpretation of those earlier data was subject to uncertainty because test conditions and/or samples differed from those representing a typical urban atmosphere. In this study, composition and levels of the hc and NO, reactants in the test mixtures were controlled to approximate pollutant makeup in present-day problem atmospheres and in atmospheres anticipated as a result of current controls.…”

Hydrocarbon Reactivity and the Kinetics of the Atmospheric Photooxidation of Nitric Oxide

“…In each of these studies, however, the hydrocarbon to nitrogen oxides ratio also varied. Since this ratio has been found important in other aspects of photochemical smog formation, 9 the relative reactivities of several hydrocarbons in the photooxidation of nitric oxide were measured at several different concentrations of reactants but at a constant hydrocarbon to nitrogen oxides ratio.…”

EffectsofHC/NOxRATIOSonIrradiated Auto Exhaust,Part II

“…1 In Part II the initial concentration levels and rates of disappearance of various individual hydrocarbons and some products are reported. The effects of the initial reactant concentration levels and the ratios of concentrations of the reactants on the rates of disappearance of hydrocarbons and the aldehyde product yields are discussed.…”