CaCO3 in rosenmund reduction, lead in Lindlar's catalyst, or steel in Raney nickel all act as poisins but the carbon in Pd/C is just for support. How do the others affect the catalytic activity but not carbon?
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2$\begingroup$ Because carbon maximizes the surface area of palladium which is incorporated with it and thus helps in increasing the activity of the reaction. Other ones are just poisons which reduce catalyst activity. $\endgroup$– Nilay GhoshCommented Aug 4, 2020 at 11:20
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2$\begingroup$ Have you checked why lead poisons the Lindlar cat? There is a specific, individual chemical reaction behind all catalyst poisons. $\endgroup$– KarlCommented Aug 4, 2020 at 12:36
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$\begingroup$ Read this Review. $\endgroup$– Mathew MahindaratneCommented Aug 4, 2020 at 17:04
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