lead bromide

It scavenges lead by forming volatile lead bromide, which is exhausted from the engine.

Indeed, the virtual elimination of lead bromide emissions from auto exhaust has been a major victory for environmentalists in the United States.

It reacts with lead residues to generate volatile lead bromides, thereby preventing fouling of the engine.

But lead is also colorless and deadly, and it combines with other products in the combustion mixture to form lead bromide, an atmospheric poison.

To prevent the resulting lead oxides from fouling the engine, gasoline was treated with an organobromine compound that converted lead oxides into the more volatile lead bromide, which was then exhausted from the engine into the environment.