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The lead is permanantly adsorbed to the catalyst, disabling anything adsorbing to the surface fo the catalyst for bond breaking and reformation.
It is termed as 'catalytic poisoning'
It is termed as 'catalytic poisoning'
Lead is not the actual catalyst in the catalytic converter. A difference metal is used, often platinum (not sure if that's the one they want you to know for an exam), and the lead is what poison's the catalyst by coating the surface so that it can't treat the exhaust from the car. This is why leaded petrol isn't used anymore.
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