Kinetics of the sulphur dioxide catalyzed recombination of radicals in hydrogen flames

Kallend, A. S.

doi:10.1016/s0010-2180(72)80213-x

Cited by 43 publications

(26 citation statements)

References 9 publications

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“…For validation of the kinetic model, calculations were compared with experimental data on the effect of SO2 addition on oxidation of H2 and/or CO in a batch reactor [8], flow reactors [9,14] and laminar premixed flames [5]. The flow reactor data were obtained in laminar flow reactors designed to approximate plug flow and the data were modeled with SENKIN [35] from the CHEMKIN library [36].…”

Section: Resultsmentioning

confidence: 99%

“…Following Alzueta et al [14], we take a closer look at the flame data of Kallend [5]. Measured H atom concentration profiles in the post-flame zone of SO2 doped premixed H2/O2/N2 flames have been used to estimate rate constants for both the SO2+H(+M) recombination reaction (R9) and the subsequent conversion of HOSO by H and OH [13].…”

Section: Flame Resultsmentioning

confidence: 99%

“…This sequence of reactions has been proposed to be the principal radical sink in fuel-rich flames doped with SO2 [2,5,7]. However, due to uncertainty in the H+SO2 reaction rate and in the fate of the HOSO intermediate, the mechanism of inhibition is still in question.…”

Section: Hoso + Oh So2 + H2o (R29)mentioning

confidence: 99%

“…The H/S/O reaction mechanism is updated and a number of key reactions are analyzed. Modeling predictions are compared with experimental results from a batch reactor [8], flow reactors [9,14] and laminar flames [5] for oxidation of H2 and/or CO doped with SO2, and the mechanisms of inhibition are discussed.…”

Section: Hoso + Oh So2 + H2o (R29)mentioning

confidence: 99%

“…The presence of SO2 has been reported to catalyze H atom removal at medium to high temperatures in rich, premixed laminar flames [1,2,3,4,5,6,7] and laboratory reactors [8,9]. The mechanism for radical removal is commonly recognized to be of the type, X+SO2+M→XSO2+M, Y+XSO2→XY+SO2, where X and Y may be H, O, or OH.…”

Section: Introductionmentioning

confidence: 99%

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Mechanisms of radical removal by SO2

Rasmussen

Glarborg

Marshall

2007

Proceedings of the Combustion Institute

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It is well established from experiments in premixed, laminar flames, jet-stirred reactors, flow reactors, and batch reactors that SO2 acts to catalyze hydrogen atom removal at stoichiometric and reducing conditions. However, the commonly accepted mechanism for radical removal, SO2 + H(+M) HOSO(+M), HOSO + H/OH SO2 + H2/H2O, has been challenged by recent theoretical and experimental results. Based on ab initio calculations for key reactions, we update the kinetic model for this chemistry and re-examine the mechanism of fuel/SO2 interactions. We find that the interaction of SO2 with the radical pool is more complex than previously assumed, involving HOSO and SO, as well as, at high temperatures also HSO, SH and S. The revised mechanism with a high rate constant for H+SO2 recombination and with SO+H2O, rather than SO2+H2, as major products of the HOSO+H reaction is in agreement with a range of experimental results from batch and flow reactors, as well as laminar flames.

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