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Whty is it necessary to remove CO when a...

Whty is it necessary to remove CO when ammonia is obtained by Haber process ?

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In Haber.s process for the production of NH from N2 and H2 iron is used as a solid catalyst. It is necessary to remove CO because it reacts with iron to form [Fe(Co)3] which is a liquid at room temperature and will interfere in the production of NH at higher temperature due to reaction of CO and H2
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