Ammonia oxidation at high pressure and intermediate temperatures

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This article describes ammonia oxidation experiments conducted at high pressure (30 bar and 100 bar) under oxidizing and stoichiometric conditions, respectively, and temperatures ranging from 450 to 925 K.

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8 p.

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Song, Yu; Hashemi, Hamid; Christensen, Jakob Munkholt; Zou, Chun; Marshall, Paul & Glarborg, Peter Creation Date: Unknown.

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This article describes ammonia oxidation experiments conducted at high pressure (30 bar and 100 bar) under oxidizing and stoichiometric conditions, respectively, and temperatures ranging from 450 to 925 K.

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8 p.

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Abstract: Ammonia 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 NH3 at 875 K. The products of reaction were N2 and N2O, while NO and NO2 concentrations were below the detection limit even under oxidizing conditions. The data were interpreted in terms of a detailed chemical kinetic model. The rate constant for the reaction of the important intermediate H2NO with O2 was determined from ab initio calculations to be 2.3 x 102 T2.994 exp(-9510 K/T) cm3 mol-1 s-1. The agreement between experimental results and model work was satisfactory. The main oxidation path for NH3 at high pressure under oxidizing conditions is NH3 → þOH NH2 →! þHO2;NO2 H2NO →! þO2 HNO →! þO2 NO →! þNH2 N2. The modeling predictions are most sensitive to the reactions NH2 + NO = NNH + OH and NH2 + HO2 = H2NO + OH, which promote the ammonia consumption by forming OH radicals, and to NH2 + NO = N2 + H2O and NH2 + NO2 = N2O + H2O, which are the main chain-terminating steps.
© 2016 Elsevier Ltd. All rights reserved.

Reprinted from Fuel, Vol 181, Song, Hashemi, Munkholt Christensen, Zhou, Marshall, Glarborg, Ammonia oxidation at high pressure and intermediate temperatures, Pages 358-365, Copyright 2016, with permission from Elsevier.

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  • Fuel, 2016. Amsterdam, The Netherlands: Elsevier

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  • Publication Title: Fuel
  • Volume: 181
  • Pages: 358-365
  • Peer Reviewed: Yes

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  • January 11, 2016

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  • Aug. 29, 2017, 9:38 a.m.

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  • Oct. 5, 2017, 1:47 p.m.

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Song, Yu; Hashemi, Hamid; Christensen, Jakob Munkholt; Zou, Chun; Marshall, Paul & Glarborg, Peter. Ammonia oxidation at high pressure and intermediate temperatures, article, Date Unknown; Amsterdam, The Netherlands. (digital.library.unt.edu/ark:/67531/metadc991012/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Arts and Sciences.