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  4. In NH3 synthesis by Haber’s process, what is the effect on the rate of the reaction with the addition of Mo and CO, respectively?

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Q. In $NH_3$ synthesis by Haber’s process, what is the effect on the rate of the reaction with the addition of Mo and CO, respectively?

KEAMKEAM 2018Surface Chemistry

Solution:

In formation of $NH _{3}$ by Haber's process.

$N _{2}(g)+3 H _{2}(g) \stackrel{\Delta, \text { catalyst }}{\longrightarrow } 2 NH _{3}(g)$

(i) When Mo is used as catalyst, it increase the rate of formation of $NH _{3}$ because it behaves as promoter.

(ii) But, when CO is used as catalyst it decreases the formation of $NH _{3}$ because it behaves as poisoning agent.