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(A) In the Haber process,the synthesis of ammonia is carried out using an iron catalyst with molybdenum as a promoter. $CO$ (carbon monoxide) acts as

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$CO$ acts as a catalyst poison for the iron catalyst.

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(A) In the Haber process,the synthesis of ammonia is carried out using an iron catalyst with molybdenum as a promoter. $CO$ (carbon monoxide) acts as a catalyst poison for the iron catalyst. If $CO$ is not removed,it binds to the active sites of the iron catalyst,thereby reducing its catalytic activity and decreasing the yield of ammonia. Therefore,it is essential to remove $CO$ before the gas mixture enters the catalyst chamber.

In the Haber process,hydrogen is obtained by reacting methane with steam in the presence of a $NiO$ catalyst. This process is known as steam reforming. Why is it necessary to remove $CO$ when ammonia is obtained by the Haber process?

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