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Ammonia is manufactured by addition of H2 to N2 on which catalyst?

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Ammonia is manufactured by addition of H2 to N2 on which catalyst?

(a) Cu

(b) Zn

(c) Fe

(d) Al

I got this question in an interview for job.

My question comes from Technical Manufacturing of Amino Compound in division Amination by Ammonolysis of Unit Processes

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Correct answer is (c) Fe

The best I can explain: Most of the world’s ammonia supply is manufactured by the addition of hydrogen to nitrogen over an iron-based catalyst at elevated temperatures and pressures.

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