Der Einfluß von Quarzglasoberflächen auf die Reduktion von NO mit NH<sub>3</sub> bei hohen Temperaturen

We have investigated the impact of surface reactions such as NH3 decomposition and radical adsorption on quartz flow reactor data for Thermal DeNO, using a model that accounts for surface chemistry as well as molecular transport. Our calculations support experimental observations that surface effects are not important for experiments carried out in low surface to volume quartz reactors. The reaction mechanism for Thermal DeNO, has been revised in order to reflect recent experimental results. Among the important changes are a smaller chain branching ratio for the NH2 + NO reaction and a shorter NNH lifetime than previously used in modeling. The revised mechanism has been tested against a range of experimental flow reactor data for Thermal DeNOx with reasonable results. The formation of N2O in Thermal DeNO, has been modelled and calculations show good agreement with experimental data. The important reactions in formation and destruction of N2O have been identified. Our calculations indicate that N20 is formed primarily from the reaction between NH and NO, even though the NH2 + NO2 reaction possibly contributes at lower temperatures. At higher temperatures N2O concentrations are limited by thermal dissociation of N20 and by reaction with radicals, primarily OH.

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Modeling the thermal DENOx process in flow reactors. Surface effects and Nitrous Oxide formation

Glarborg¹,

Dam‐Johansen²,

Miller

et al. 1994

Int J of Chemical Kinetics

169

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Experimental characterization of the influence of CO on the high-temperature reduction of NO by NH3

Suhlmann

Rotzoll

1993

Fuel

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Ammonia oxidation at high pressure and intermediate temperatures

Song

Hashemi

Christensen

et al. 2016

Fuel

290

132

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a b s t r a c tAmmonia oxidation experiments were conducted at high pressure (30 bar and 100 bar) under oxidizing and stoichiometric conditions, respectively, and temperatures ranging from 450 to 925 K. The oxidation of ammonia was slow under stoichiometric conditions in the temperature range investigated. Under oxidizing conditions the onset temperature for reaction was 850-875 K at 30 bar, while at 100 bar it was about 800 K, with complete consumption of NH 3 at 875 K. The products of reaction were N 2 and N 2 O, while NO and NO 2 concentrations were below the detection limit even under oxidizing conditions. The data were interpreted in terms of a detailed chemical kinetic model.

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Der Einfluß von Quarzglasoberflächen auf die Reduktion von NO mit NH₃ bei hohen Temperaturen

Cited by 5 publications

References 4 publications

Modeling the thermal DENOx process in flow reactors. Surface effects and Nitrous Oxide formation

Modeling the thermal DENOx process in flow reactors. Surface effects and Nitrous Oxide formation

Experimental characterization of the influence of CO on the high-temperature reduction of NO by NH3

Ammonia oxidation at high pressure and intermediate temperatures

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Der Einfluß von Quarzglasoberflächen auf die Reduktion von NO mit NH3 bei hohen Temperaturen

Cited by 5 publications

References 4 publications

Modeling the thermal DENOx process in flow reactors. Surface effects and Nitrous Oxide formation

Modeling the thermal DENOx process in flow reactors. Surface effects and Nitrous Oxide formation

Experimental characterization of the influence of CO on the high-temperature reduction of NO by NH3

Ammonia oxidation at high pressure and intermediate temperatures

Contact Info

Product

Resources

About

Der Einfluß von Quarzglasoberflächen auf die Reduktion von NO mit NH₃ bei hohen Temperaturen