The Addition Effect of Fe(CO)₅on Methane Ignition

Kinetic Modeling Study of the Effect of Iron on Ignition and Combustion of n-Heptane in Counter-flow Diffusion Flames

“…Diesel ignition and combustion in CI engines are characterized by rich premixed ignition and subsequent premixed combustion, followed by diffusion combustion . The effect of iron in premixed combustion of hydrocarbon fuels has been studied and reported in the literature. − Therefore, the present kinetic modeling approach included two parts, an idealized premixed ignition model and an opposed counter-flow diffusion flame model. Because of the complex composition of real diesels, n -heptane ( n -C 7 H 16 ) was chosen as a model fuel because it has a similar cetane number to diesel and has also been frequently used as a diesel fuel surrogate …”

“…Contrary to reports that Fe­(CO) 5 inhibited combustion of hydrocarbon and hydrogen in premixed flames by reducing the flame speed, Linteris and Babushok found that the addition of iron-containing compounds [Fe­(CO) 5 , Fe, FeO, and FeOH] at dosing ratios less than 150 ppm decreased the ignition delay time by a factor of 2–3 for H 2 /air flames. Matsuda found that Fe­(CO) 5 , in the order of a few 100 ppm, greatly accelerated the consumption of CO, and in recent shock-tube studies of CH 4 /O 2 /Ar mixtures, Park at al . found that Fe­(CO) 5 at dosing ratios of 500, 1000, and 2000 ppm in the mixture shortened the ignition delay time, indicating a promotion effect of the iron-based additive.…”

“…In addition to the studies on the performance of the catalyst in diesel engines, as shown in Table , there have been few studies with an effort to understand working mechanisms of organometallic-based catalysts in the ignition and combustion processes of different fuels recently. Iron pentacarbonyl [Fe­(CO) 5 ] was shown to accelerate ignition and combustion of CO, H 2 , and hydrocarbons. − Staude et al measured the temperature profiles in a premixed lean laminar flame of H 2 /O 2 /Ar with Fe­(CO) 5 added and found that the addition of Fe­(CO) 5 increased the flame temperature throughout the combustion zone. Shvartsberg et al numerically modeled hydrogen flames at a low pressure of 3 kPa and found that the addition of iron to the flame resulted in additional heat release and higher flame temperatures.…”