TY - JOUR

T1 - Mass Spectrometric Study of Cations in a Non-Sooting Ethylene Flame

AU - Cherepanov, A. V.

AU - Knyazkov, D. A.

N1 - This study was supported by the Russian Science Foundation (project no. 23-23-00521, https://rscf.ru/project/23-23-00521/ ).

PY - 2024/9/4

Y1 - 2024/9/4

N2 - Understanding the kinetics and mechanism of formation of charged species in flames is of great importance for the development of ion-sensitive combustion control technologies. The development of predictive models involving ion-molecular reactions, however, is hampered by the lack of experimental data. The paper presents the results of our study of the spatial distribution of cations naturally occurring in a fuel-rich, non-sooting, laminar premixed ethylene/oxygen/argon flame using flame sampling molecular beam mass spectrometry. Particular attention is paid to the interpretation of the obtained mass spectra of cations, which are distorted by the influence of the sampling probe. The reliability of the proposed interpretation of the spectra is confirmed by consistency between the cationic and neutral flame structures. The study focused on cations with the general formula CxH (53 < m/z < 165), actively formed in the reaction zone of the fuel-rich flame. Two main mechanisms of their formation are discussed: proton transfer from HCO+ and H3O+ (key cations of flame) to neutral intermediates whose mass is 1 amu smaller and gradual increase in the mass of ions in the reactions of lighter CxH ions with neutral intermediates having high concentrations in the flame (acetylene, diacetylene, propylene, propyne, etc.).

AB - Understanding the kinetics and mechanism of formation of charged species in flames is of great importance for the development of ion-sensitive combustion control technologies. The development of predictive models involving ion-molecular reactions, however, is hampered by the lack of experimental data. The paper presents the results of our study of the spatial distribution of cations naturally occurring in a fuel-rich, non-sooting, laminar premixed ethylene/oxygen/argon flame using flame sampling molecular beam mass spectrometry. Particular attention is paid to the interpretation of the obtained mass spectra of cations, which are distorted by the influence of the sampling probe. The reliability of the proposed interpretation of the spectra is confirmed by consistency between the cationic and neutral flame structures. The study focused on cations with the general formula CxH (53 < m/z < 165), actively formed in the reaction zone of the fuel-rich flame. Two main mechanisms of their formation are discussed: proton transfer from HCO+ and H3O+ (key cations of flame) to neutral intermediates whose mass is 1 amu smaller and gradual increase in the mass of ions in the reactions of lighter CxH ions with neutral intermediates having high concentrations in the flame (acetylene, diacetylene, propylene, propyne, etc.).

KW - ethylene

KW - fuel-rich flame

KW - ion-molecular reactions

KW - ions in flames

KW - molecular beam mass spectrometry

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85203073444&origin=inward&txGid=5247b6080a4c0d31cd6d0ffc89f75d68

UR - https://www.mendeley.com/catalogue/eef4dee4-82a3-3a55-8250-926a57e9dbb0/

U2 - 10.1134/S0023158424601670

DO - 10.1134/S0023158424601670

M3 - Article

VL - 65

SP - 309

EP - 319

JO - Kinetics and Catalysis

JF - Kinetics and Catalysis

SN - 0023-1584

IS - 4

ER -