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The catalyst and promoter respectively used in the Haber's process of industrial synthesis of ammonia are
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$\mathrm{Fe}, \mathrm{Mo}$
In the Haber's process for the synthesis of ammonia from $\mathrm{N}_2$ and $\mathrm{H}_2$, $\mathrm{Fe}$ is used as catalyst and Mo works as activator.
$\mathrm{N}_2+3 \mathrm{H}_2 \stackrel{\mathrm{Fe}, \mathrm{Mo}}{\rightleftharpoons} 2 \mathrm{NH}_3+22.4 \mathrm{kcal}$
$\mathrm{N}_2+3 \mathrm{H}_2 \stackrel{\mathrm{Fe}, \mathrm{Mo}}{\rightleftharpoons} 2 \mathrm{NH}_3+22.4 \mathrm{kcal}$
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