Interactions of hydrogen and nitric oxide in outwardly propagating spherical flame: Insight into non-hydrocarbon NOX reduction mechanism

Jiabiao Zou, Jianguo Zhang, Tianyou Lian, Bowen Mei, Yuyang Li*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Co-firing ammonia (NH3) and hydrogen (H2) or H2-rich fuel and partially cracking NH3 are promising non-carbon combustion techniques for gas turbines and marine engines, raising a growing need to understand the interactions of H2 and nitric oxide (NO) as well as the non-hydrocarbon nitrogen oxides (NOX) reduction mechanism under flame conditions. In this work, the outwardly propagating spherical flame method was used to investigate the laminar flame propagation of H2/NO and H2/NO/nitrogen (N2) mixtures at initial pressure (Pu) of 2 atm, initial temperature (Tu) of 298 K and equivalence ratios of 0.2-1.4. The laminar burning velocities (LBVs) of H2/NO mixtures are generally 5-10 times lower than those of H2/air mixtures, while the dilution of N2 can dramatically inhibit the laminar flame propagation. A kinetic model of H2/NO combustion was constructed and validated against the new data in this work and other types of experimental data in literature. The modeling analyses reveal that NO+H=N+OH becomes the most important chain-branching reaction in H2/NO reaction system, while the LBV data of H2/NO mixtures in this work can provide highly sensitive validation targets for the kinetics in H2 and NO interactions. Furthermore, the NO reduction to N2 mainly proceeds through NO+N=N2+O under various H2/NO ratios, and NO+O=N+O2 is found to have a significant contribution to NO reduction under NO-rich conditions.

Original languageEnglish (US)
Pages (from-to)4299-4307
Number of pages9
JournalProceedings of the Combustion Institute
Issue number4
StatePublished - Jan 2023

Bibliographical note

Funding Information:
The research was supported by National Key R&D Program of China (2017YFE0123100) and National Natural Science Foundation of China ( 91841301, U1832171 ).

Publisher Copyright:
© 2022 The Combustion Institute


  • Hydrogen
  • Kinetic model
  • Laminar burning velocity
  • Nitric oxide
  • Non-hydrocarbon NO reduction

ASJC Scopus subject areas

  • General Chemical Engineering
  • Mechanical Engineering
  • Physical and Theoretical Chemistry


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