Reactions of C2-hydrocarbons

As mentioned earlier (see introduction to Section 5), oxidation of C2-species plays an important general role in hydrocarbon combustion. Central points of current modeling research are C2H5 reactions (Figs. 2 and 3) because of their rate-determining character and reactions of acetylene, which is of special interest in rich hydrocarbon combustion due to its roles in the processes of soot and (probably) non-Zeldovich NO formation (Warnatz et al, 1982). 

In all three cases, there are sufficient data to define curved Arrhenius plots (Figs. 51 to 53). For H + CjHg C2H5 + H2 the recommendation by Clark 

These reactions (Fig. 54) are not important in determining rates of combustion. The rate coefficient of the HO2 reaction is estimated from data on HO2 attack on single C-H bonds (Baldwin et a/., 1977). 

The reverse of this step has been discussed before (Section 5.2). There are sufficient rate data on the pressure dependence of this reaction to allow the determination of Arrhenius parameters for low- and high-pressure rate coefficients and (Fig. 55). Examples of fall-off curves are given in Fig. 36. 

Reactions of C2H5 radicals play a central part in hydrocarbon combustion because of the rate-determining character of the competition between thermal 

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