Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Measurements of Particle Formation in Flames Inhibited by Iron Pentacarbonyl

Published

Author(s)

M D. Rumminger, Gregory T. Linteris

Abstract

Certain metallic compounds have been found to be substantially more effective flame inhibitors than halogen-containing compounds. In particular, iron pentacarbonyl (Fe(CO)5) was found to be one of the strongest inhibitors--up to two orders of magnitude more effective than CF3Br at reducing the burning velocity of premixed hydrocarbon-air flames. Although Fe(CO)5 is highly toxic, understanding its inhibitory effect could lead to development of effective non-toxic agents. Measurements of Fe(CO)5-inhibited premixed flames have shown that the inhibition varies with the Fe(CO)5 concentration: at low mole fraction the burning velocity is strongly dependent on inhibitor mole fraction, while at high Fe(C0)5 mole fraction the burning velocity is nearly independent of inhibitor mole fraction. A critical part of the research on Fe(C0)5 is to understand iron pentacarbonyl's diminishing effectiveness at high mole fraction in order to avoid similar behavior in future fire suppressants. A plausible but unconfirmed explanation for iron pentacarbonyl's reduced effectiveness under certain conditions is that particles form, thus reducing the gas-phase mole fraction of active inhibiting species. To investigate this possibility, we use laser-light scattering to measure particles in premixed flames with added Fe(C0)5 and determine if the conditions of high particle concentration correspond to the regions of reduced inhibition effect. Alternatively, if there is high particle density for conditions at which Fe(C0)5 as a strong inhibition effect, then the search for halon alternatives could be directed toward chemicals that produce similar condensed-phase compounds.
Proceedings Title
Combustion Institute, 1st Joint Meeting of the U.S. Sections: Western States, Central States,
Eastern States. Proceedings.
Conference Dates
March 14-17, 1999
Conference Location
Washington, DC, US

Keywords

premixed flames, flame extinguishment, halon alternatives

Citation

Rumminger, M. and Linteris, G. (1999), Measurements of Particle Formation in Flames Inhibited by Iron Pentacarbonyl, Combustion Institute, 1st Joint Meeting of the U.S. Sections: Western States, Central States, Eastern States. Proceedings. , Washington, DC, US, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=914367 (Accessed April 23, 2024)
Created March 13, 1999, Updated October 12, 2021