Understanding non-equilibrium N2O/NOx chemistry in plasma-assisted low-temperature NH3 oxidation

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

9 Scopus Citations
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Author(s)

  • Hongtao Zhong
  • Xingqian Mao
  • Ziyu Wang
  • Timothy Ombrello
  • Yiguang Ju

Detail(s)

Original languageEnglish
Article number112948
Journal / PublicationCombustion and Flame
Volume256
Online published28 Jul 2023
Publication statusPublished - Oct 2023
Externally publishedYes

Abstract

Ammonia represents one of most promising zero-carbon energy solutions to address the increasingly urgent climate change problem. However, the existing utilization of ammonia faces significant challenges from low chemical reactivity and high NOx/N2O emissions, which cause severe inefficiency issues such as cold start and cycle variability of power generation, and detrimental effects on air quality, respectively. A sustainable and energy-efficient approach to tackle the above challenges is low temperature plasma which enables non-equilibrium energy and chemical utilization of ammonia such as oxidation using renewable electricity. As such, this work, for the first time, explores plasma assisted ammonia oxidation at room temperature with a focus on unveiling non-equilibrium NOx/N2O reaction pathways by combining in-situ laser diagnostics with plasma modeling. We found that the non-equilibrium plasma controls the NOx formation by supplying O/H/N atoms via electron-impact dissociation and collisional quenching of excited species. The N2O formation follows a two-step mechanism, where electron-impact reactions first provide amine radicals which further react with NOx to generate N2O. These pathways facilitate a high-efficiency and environment-friendly operation of plasma assisted ammonia oxidation with enhanced reactivity and reduced NOx/N2O emissions through manipulating mixture compositions and plasma discharge parameters. © 2023 The Combustion Institute.

Research Area(s)

  • Ammonia, Laser diagnostics, N2O/NOx chemistry, Nitrogen cycle, Plasmas, Sustainable energy

Citation Format(s)

Understanding non-equilibrium N2O/NOx chemistry in plasma-assisted low-temperature NH3 oxidation. / Zhong, Hongtao; Mao, Xingqian; Liu, Ning et al.
In: Combustion and Flame, Vol. 256, 112948, 10.2023.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review