Oxidation rate constants

Eig. 2. Efficiency to a primary intermediate as % of maximum (zero conversion) efficiency x axis is feed conversion. Parameters are oxidation rate-constant ratios ( 2 / i) for primary intermediate vs feed and reactor type A, plug-flow or batch B, back-mixed. 

A typical oxidation is conducted at 700°C (113). Methyl radicals generated on the surface are effectively injected into the vapor space before further reaction occurs (114). Under these conditions, methyl radicals are not very reactive with oxygen and tend to dimerize. Ethane and its oxidation product ethylene can be produced in good efficiencies but maximum yield is limited to ca 20%. This limitation is imposed by the susceptibiUty of the intermediates to further oxidation (see Figs. 2 and 3). A conservative estimate of the lower limit of the oxidation rate constant ratio for ethane and ethylene with respect to methane is one, and the ratio for methanol may be at least 20 (115). 

Oxidation rate constant k, for gas-phase second order rate constants, koH for reaction with OH radical, kN03 with N03 radical and ko3 with 03 or as indicated, data at other temperatures and/or the Arrhenius expression see reference ... 

Oxidation rate constant k, for gas-phase second order rate constants, k0H for reaction with OH radical, kNQ3 with N03 radical and k03 with 03 or as indicated data at other temperatures see reference k0(3P) = 5.8 x lO14 cm3 molecule-1 s-1 for the reaction with 0(3P) (Herron Huie 1973) koe = (3.74 0.13) x 10-12 cm3 molecule-1 s-1 at 300 K (relative rate method, Darnall et al. 1978) kOH = 5.0 x 10-12 cm3 molecule-1 s-1 (Atkinson et al. 1979)... 

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