What are the effects of fuel anti-knock agents?

[DiKennedy]

The effects of fuel anti-knock agents include: increasing gasoline octane number, improving vehicle power performance, reducing pollutant emissions from vehicle exhaust, and anti-knock agents also have an improving effect on phosphorus poisoning of automotive exhaust catalytic converters. Fuels using anti-knock agents can extend the lifespan of catalysts. Anti-knock agents, also known as anti-detonation agents, gasoline anti-knock agents, or octane boosters, are a class of high-molecular polymers used to increase octane number to prevent or mitigate engine knocking caused by gasoline combustion. Alkyl lead became a widely used anti-knock agent starting in 1923, with tetramethyl lead, tetraethyl lead and their mixtures also commonly used. Lead-containing anti-knock agents cause vehicles to emit harmful gases that pollute the air. In unleaded gasoline, other types of anti-knock agents are used instead, such as manganese compound anti-knock agents like methylcyclopentadienyl manganese tricarbonyl.