Lead components are added to gasoline and why was it removed with the advent of catalytic convertors

Lead components, specifically tetraethyl lead (TEL), were added to gasoline primarily as an anti-knock agent. Engine knocking, also known as detonation, is an undesirable phenomenon that occurs when the air-fuel mixture in the combustion chamber ignites prematurely or unevenly. This can cause a knocking sound and potentially damage the engine. TEL was effective in preventing engine knocking and improving the performance of gasoline-powered engines.

However, with the advent of catalytic converters, the use of lead components in gasoline was phased out and eventually eliminated. Catalytic converters are emissions control devices installed ____ ________ ____ ______ _________ _________ ______.
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