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Why is it necessary to remove CO when am...

Why is it necessary to remove CO when ammonia is obtained by Haber's process ?

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Carbon monoxide `(CO)` acts as a poison for the catalyst iron as well as promoter molybdenum which are used in the Haber's process. Moreover, it is likely to combine with iron to from iron carbonyl `Fe(CO)_(5)` Therefore it is necessary to remove it from the reaction mixture by suitable means.
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