tetraethyl lead


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tetraethyl lead

(tĕt'rəĕth`əl), (C2H5)4Pb, viscous, colorless, poisonous liquid. It is an organometallic compound prepared by reacting ethyl chloride with a sodium-lead alloy. When added to gasoline, it improves the combustion characteristics (see octane numberoctane number,
figure of merit representing the resistance of gasoline to premature detonation when exposed to heat and pressure in the combustion chamber of an internal-combustion engine.
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). When tetraethyl lead burns in an engine, lead oxide is formed. Ethylene dibromide is usually also added to the gasoline; on burning, the resulting mixture forms products that react with the lead oxide to form lead bromide, a volatile compound that escapes from the engine with other exhausted products. Because the lead bromide is poisonous, lead-free gasolines are required in the United States. An additional reason for lead-free gas is that the lead in the exhaust pipe would poison the catalytic converter that is standard equipment for U.S. cars. Catalytic converters which serve to oxidize unburned hydrocarbons, carbon monoxide, and nitrogen oxides contain platinum group metals that are inactivated by lead.

tetraethyl lead

a colourless oily insoluble liquid used in petrol to prevent knocking. Formula: Pb(C2H5)4
References in periodicals archive ?
ASTM D-910 defines what has become the ideal piston aviation fuel, apart from the toxic characteristics of tetraethyl lead.
Adding tetraethyl lead to gasoline resulted in large emissions into the
In a statement, the SFO said Mr Jennings "is accused of two allegations of conspiracy to corrupt, in that he gave or agreed to give corrupt payments to public officials and other agents of the Gover nments of Indonesia and Iraq as inducements to secure, or as rewards for having secured, contracts from those gover nments for the supply of its products including Tetraethyl Lead by Innospec.
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For lead, the authors present the history of tetraethyl lead as a gasoline additive and white lead as a paint additive.
Tetraethyl lead has been added to petrol since the 1930s as an effective antiknock and also antiwear additive.
Tetraethyl lead was the invention of General Motors and produced by contract by DuPont and Standard Oil of New Jersey (which later became Exxon).
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In this regard, McGrayne profiles Clair Patterson, who discovered that leaded gasoline was polluting the planet and spearheaded efforts to curtail the use of tetraethyl lead.