Ferrocene - information and some facts
Ferrocene is a yellow-orange pretty harmless powder. It is difficult to make
yourself but sometimes one can buy it online. It is a replacement for tetraethyl
lead and is (as hexamine) octane boosting, therefore it also has lubricating
properties. It is soluble in gasoline, diesel and ethanol in their original form.
Like MCO20 and the ib-additive will it burns dissolved in alcohol during a production
of perceptible sparks. Its origin derived from cyclopentadiene acid and is therefore
a cyclic hydrocarbon such as benzene, but instead of a six sided benzene ring
(hexagon) has a pentadiene ring one side less, so it has five sides (pentagon)
or carbon atoms. The number of hydrogen atoms is however six for both
benzene- and pentadiene rings. Cyclopentadiene acid is obtained as a
by-product in the cracking of petroleum.
Benzene ring C6H6
Pentadiene ring C5H6
Ferrocene is therefore an iron metal salt of cyclopentadiene acid. Compared for
example iron benzoate (i¤b) which is an iron metal salt of benzoic acid. Conversely
dissolves iron benzoate best in alcohol and not so good in gasoline, while ferrocene
dissolves easily in gasoline, benzene, toluene and acetone but pretty bad in alcohols.
Even diesel and white spirit is good solvent for ferrocene.
Often one can mix the purchased powder directly into gasoline without any
insoluble impurities are left unsolved. If one in the other hand wants to solve
ferrocene in diesel or alcohol so should one be aware that not all will be
solved which mean that the fuel filter after some time can become clogged.
Separation or filtration may therefore be necessary in some cases. The color
of the fuel is changed at the red direction and where the combustion takes
place forms a reddish coating of iron oxide. Ferrocene can probably be
regarded as the main ingredient in so-called MPG-Caps, or colloquially: fuel
tablets. After numerous tests, I note that ferrocene together with hexamine
(HMTA) have no or little importance to achieve lower fuel consumption, apart
from this increases ferrocene the anti-knock ability and contribute to a less
Ferrocene dissolves also good in nonpolar fuel additives and its possible to
dissolve 5 ml of ferrocene in 100 ml A40 (at most). Other additives that could
keep ferrocene is: ISO, X66, AT2, hoGA etc. The fuel additive A40 can also
be prepared with omega-Fe without that the solubility of ferrocene decreases
The big disadvantage of ferrocene is that
the iron trioxide layer conducts current. There are two oxide types formed:
one is iron trioxide and the other is iron tetraoxide. Tetraoxide is not conducting
which however trioxide is. If the trioxide dominates around the spark plug will
it leads to a short circuit - instead of an arc flashover. This has the consequence
that the spark fails - the engine misfires. You can tell it easily and it can be fixed
by cleaning the plugs. It's therefore not a clever idea to dispense too
much ferrocene and one should be fairly cautious with ferrocene whatsoever.
The only benefit of ferrocene as I see it is to mix it with diesel, where no
spark plugs can be found.
My snip I did on eBay - 250 grams for $20. Only one distributor could be
found but the price was affordable. 5 ml weighs about 2.5 grams. The most
costly component is however HMTA - unless you can get it cheap. Then acetone
which now is quite expensive in Sweden. Perhaps we should produce HMTA
and acetone oneself? There are certainly pages about this online or on