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- W1987369318 abstract "Soot nucleation and growth mechanisms involving PAH and C2H2 in distinct roles were quantitatively tested against experimental data including profiles of soot, PAH, C2H2, and other species present in flat benzene/oxygen/argon flames at 20 and 40 torr and equivalence ratios of 2.0, 2.125, and 2.4. In all the flames, the concentration of high molecular weight PAH was found to exhibit a maximum value near the onset of soot nucleation and to decline in the nucleation zone. A nucleation mechanism involving growth by reactive coagulation of heavy PAH in competition with destruction through OH attack gave good agreement between measured and predicted features of the soot nucleation kinetics. Conversely, soot nucleation through the growth of PAH by sequential addition of C2H2 with no PAH-PAH coagulation was too slow to agree with data. PAH also contributed significantly to the postnucleation growth of soot particles. Most of the mass of the soot system appears to come from C2H2 through (a) the formation of the heavy PAH precursors to soot nuclei and the PAH that add to the growing soot particles and (b) direct C2H2 addition to the soot. Both the growth and oxidation reactions in these mechanisms are formulated as involving localized δ-radicals (i.e., aryl radicals in the case of PAH and active sites in the case of soot). The apparent collision efficiency of PAH with the soot surface is between 0.1 and 0.5 in the region where PAH appears to contribute significantly to the soot mass." @default.
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- W1987369318 date "1992-01-01" @default.
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- W1987369318 title "The roles of pah and acetylene in soot nucleation and growth" @default.
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- W1987369318 doi "https://doi.org/10.1016/s0082-0784(06)80114-1" @default.
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