Inhibition of Premixed Methane Flames by Manganese and Tin Compounds

Published

May 1, 2002

Author(s)

Gregory T. Linteris, Vadim D. Knyazev, Valeri I. Babushok

Abstract

The first experimental measurements of influence of manganese- and tin-containing compounds (MMT, TMT) on burning velocity of methane/air flames are presented. Comparisons with Fe(CO)₅ and CF₃Br demonstrate that manganese and tin-containing compounds are effective inhibitors. The inhibition efficiency of MMT is about a factor of two less than that of iron pentacarbonyl, and that of TMT is about twenty-six times less effective, although TMT is about twice as effective as CF₃Br. There exist conditions for which both MMT and TMT show a loss of effectiveness beyond that expected due to radical depletion, and the cause is believed to be particle formation. Kinetic models describing the inhibition mechanisms of manganese- and tin-containing compounds are suggested. Simulations of MMT- and TMT-inhibited flames show reasonable agreement with experimental data. The decomposition of the parent molecule for the tin and manganese species is found to have a small effect on the inhibition properties for the concentrations in this work. The inhibition effect of TMT is determined mostly by the rate of the association reaction H+SnO+M SnOH+M and the catalytic recombination cycle is completed by the reactions SnOH+HSnO+H₂ and SnOH+OHSnO+H₂O. The inhibition mechanism by manganese-containing compounds includes the reactions: MnO + H₂O Mn(OH)₂; Mn(OH)₂ + H = MnOH + H₂O, and MnOH(H₂) and the burning velocity is most sensitive to the rate of Mn(OH)₂ + H MnOH + H₂O.

Citation

Combustion and Flame

Volume

129

Issue

No. 3

Pub Type

Journals

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Keywords

fire suppression, flame inhibition, halon replacement, kinetic mechanism, manganese, organometallic, tin

Citation

Linteris, G. , Knyazev, V. and Babushok, V. (2002), Inhibition of Premixed Methane Flames by Manganese and Tin Compounds, Combustion and Flame, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=861167 (Accessed October 12, 2025)