Evidence for a new no production mechanism in flames

Harrington, Joel E.; Smith, Gregory P.; Berg, Pamela A.; Noble, Alison; Jeffries, Jay B.; Crosley, David R.

doi:10.1016/s0082-0784(96)80038-5

Cited by 47 publications

(32 citation statements)

References 10 publications

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“…If Δ f H 298 (NNH) is in the high end of the reported range, the steady-state level of NNH and thereby the NO yield of the mechanism will be correspondingly lower. A change of 1.5 kcal mol -1 in the heat of formation of NNH corresponds roughly to a factor of two difference in the formation rate of NO [27]. The value of 59.6 kcal mol -1 from GRI-Mech [115], which has been used in most previous modeling studies, is consistent with the present value of Δ f H 298 (NNH) = 59.7 kcal mol -1 .…”

Section: The Nnh Mechanism Of No Formationsupporting

confidence: 84%

“…with H 2 or H 2 /CO mixtures as fuel. Reported experiments with these fuels, earlier used to quantify the NNH mechanism, include fuelrich, low-pressure [27] and atmospheric pressure [28,31] flames, as well as lean stirred-reactor experiments [116,117].…”

Section: The Nnh Mechanism Of No Formationmentioning

confidence: 99%

“…In the present work, we have selected the low-pressure, fuel-rich flames of Harrington et al [27] and the lean jet-stirred reactor experiments of Steele et al [116] for comparison with model predictions. The low-pressure H 2 /air flames of Harrington et al were designed to minimize formation of NO through thermal NO and N 2 O mechanisms while yielding measurable quantities of NO from NNH.…”

Section: The Nnh Mechanism Of No Formationmentioning

confidence: 99%

“…Since the low-pressure flames of Harrington et al [27] may have been flawed by reactions on the burner surface due to heavy stabilization and the conditions of the lean jet-stirred reactor experiments of Steele et al [116] favor NO formation through N 2 O rather than NNH, it is desirable with novel experimental results to quantify the NO formation through the NNH mechanism and to serve to validate the chemical kinetic model. However, we believe that the present mechanism provides a more accurate prediction of NO from NNH than previous models used in literature.…”

Section: The Nnh Mechanism Of No Formationmentioning

confidence: 99%

“…A subsequent reaction NNH + O = NH + NO then offers a high temperature pathway for NO formation, the so-called NNH mechanism. A number of experimental and modeling studies [27][28][29][30][31][32] support the existence of the NNH mechanism, and kinetic modeling indicates that it is of importance in premixed and non-premixed flames of both hydrogen [33][34][35][36] and hydrocarbons [37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

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The role of NNH in NO formation and control

Klippenstein

Harding

Glarborg³

et al. 2011

Combustion and Flame

320

268

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One of the remaining issues in our understanding of nitrogen chemistry in combustion is the chemistry of NNH. This species is known as a key intermediate in Thermal DeNO x , where NH 3 is used as a reducing agent for selective non-catalytic reduction of NO. In addition, NNH has been proposed to facilitate formation of NO from thermal fixation of molecular nitrogen through the socalled NNH mechanism. The importance of NNH for formation and reduction of NO depends on its thermal stability and its major consumption channels. In the present work, we study reactions on the NNH + O, NNH + O 2 , and NH 2 + O 2 potential energy surfaces using methods previously developed by Miller, Klippenstein, Harding, and their co-workers. Their impact on Thermal DeNO x and the NNH mechanism for NO formation is investigated in detail.

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Section: The Nnh Mechanism Of No Formationsupporting

confidence: 84%

Section: The Nnh Mechanism Of No Formationmentioning

confidence: 99%

Section: The Nnh Mechanism Of No Formationmentioning

confidence: 99%

Section: The Nnh Mechanism Of No Formationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The role of NNH in NO formation and control

Klippenstein

Harding

Glarborg³

et al. 2011

Combustion and Flame

320

268

View full text Add to dashboard Cite

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NO _x Formation and Models

Bowman

2014

Encyclopedia of Automotive Engineering

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The principal nitrogen oxides emitted from spark ignition and diesel engines are nitric oxide ( NO ), nitrogen dioxide ( NO 2 ), collectively referred to as NO x , and nitrous oxide ( N 2 O ). Accurate prediction of nitrogen oxide emissions from these engines requires knowledge of the important gas‐phase reaction pathways involving nitrogen species and the rate parameters for these pathways. In this chapter, the current state of understanding of the gas‐phase reaction mechanisms for nitrogen oxide chemistry in combustion, including the mechanisms for NO formation from molecular nitrogen in the air and from nitrogen present in fuel additives and the mechanism for NO removal via a gas‐phase reaction process termed reburning is discussed. In many combustion processes, these formation and removal pathways are coupled. In addition, the reaction mechanisms for the formation and removal of NO 2 and N 2 O are described. The relative importance of the different NO formation and removal pathways in different combustion environments is presented.

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NO_xFormation, Control and Reduction Techniques

Konnov

Javed

Kassman

et al. 2010

Handbook of Combustion

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The formation of nitrogen oxides (NO x ) in combustion systems is an important environmental concern. The control of NO x emissions and modern reduction techniques is based on worldwide investigations performed in this field. In this chapter, developments in the understanding of nitrogen chemistry in flames during the pas twenty years following the seminal studies of Miller and Bowman [1] are summarized. The different routes of NO x formation, including the newly proposed NNH route and prompt‐NO via NCN and other precursors, are discussed. The results of recent laboratory studies on NO x control through reburning are also detailed. Other approaches for NO x control, including low‐NO x burners, flue gas recirculation, and over‐fire air, are also outlined. Of special and practical interest are the selective noncatalytic reduction (SNCR) techniques; these include ammonia‐based, urea‐based, ammonium carbonate‐based SNCRs, and additive‐enhanced SNCR. An example of nitrogen‐containing additives for the simultaneous reduction of NO x and minimization of corrosion is presented. Finally, potential future developments and areas of use of these reduction techniques are discussed.

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Evidence for a new no production mechanism in flames

Cited by 47 publications

References 10 publications

The role of NNH in NO formation and control

The role of NNH in NO formation and control

NO _x Formation and Models

NO_xFormation, Control and Reduction Techniques

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Evidence for a new no production mechanism in flames

Cited by 47 publications

References 10 publications

The role of NNH in NO formation and control

The role of NNH in NO formation and control

NO x Formation and Models

NOxFormation, Control and Reduction Techniques

Contact Info

Product

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NO _x Formation and Models

NO_xFormation, Control and Reduction Techniques