Experimental and kinetic modeling study of the effect of sulfur dioxide on the mutual sensitization of the oxidation of nitric oxide and methane

摘要: New experimental results were obtained for the mutual sensitization of oxidation NO and methane in a fused silica jet-stirred reactor operating at 10 5 Pa, over temperature range 800-1150 K. The effect addition sulfur dioxide was studied. Probe sampling followed by online FTIR analyses off-line GC-TCD/FID allowed measurement concentration profiles reactants, stable intermediates, final products. A detailed chemical kinetic modeling present experiments performed. An overall reasonable agreement between data obtained. According to modeling, proceeds via 2 conversion HO CH 3 O . is more important low temperatures (800 K) than higher (850-900 where production mostly due reaction with favored radicals yielded from fuel. OH resulting accelerates fuel: + → OH+ 4 In lower this study, further ; At temperatures, involves : NO; -> O. This sequence reactions H; +OH HCO; HCO H show that unexpectedly, SO has no measurable on kinetics conditions, whereas it frequently acts as an inhibitor combustion. result rationalized analysis indicating inhibiting +H HOSO, HOSO+O +HO , equivalent H+O =HO balanced promoting step NO+HO +OH.