Flow reactor study of NH3/DMM oxidation

Ruiz-Gutiérrez, Adrián (Universidad de Zaragoza) ; Mazano-Peña, Daniel ; Alzueta, María U. (Universidad de Zaragoza)

Resumen: This study presents a comprehensive investigation of the conversion of ammonia (NH3) and dimethoxymethane (DMM) mixtures in a quartz flow reactor. Experiments were carried out at atmospheric pressure and across a wide range of conditions to elucidate species profiles, many of which have not been extensively characterised previously. The operational parameters included temperatures between 875 and 1425 K, NH3/DMM ratios from 0.48 to 10.86, and oxygen excess ratios (λ) from 0 to 3.12. Quantification of numerous compounds was achieved using a micro gas chromatograph (GC) in combination with a continuous gas analyser. Simulations with an updated detailed chemical kinetic mechanism were carried out in order to elucidate the conversion pathways of the mixture constituents. Calculations were in good consistency with the experimentally observed ones for the key species. NH3 conversion was highly sensitive to variations in O2, whereas DMM exhibited only minor changes in its reaction temperature (approximately 50 K). The principal consumption pathway of DMM involves hydrogen abstraction from the central carbon by CH3 radicals. This facilitates the access of ammonia to a greater number of radicals, as competition for OH or O radicals is less pronounced. NO formation was influenced by the presence of DMM, increasing with both the oxygen excess ratio (λ) and the proportion of DMM in the mixture. It was further concluded that DMM exerts a significant influence on NH3 behaviour when the NH3/DMM ratio is ≤ 1, an effect that decreases at higher initial O2 concentrations (λ > 1). Overall, this work provides new insights into the conversion behaviour of NH3/DMM mixtures under the investigated conditions and provides essential reference data for further development of detailed kinetic models.

Idioma: Inglés

DOI: 10.1016/j.combustflame.2026.114966

Año: 2026

Publicado en: Combustion and Flame 288 (2026), 114966 [9 pp.]
ISSN: 0010-2180

Financiación: info:eu-repo/grantAgreement/ES/DGA/T22-23R
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2021-12432OB-I00
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2025-155489OB-I00
Financiación: info:eu-repo/grantAgreement/EUR/MICINN/TED2021-129557B-I00

Tipo y forma: Article (Published version)

Área (Departamento): Área Tecnologi. Medio Ambiente (Dpto. Ing.Quím.Tecnol.Med.Amb.)