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Iron oxide catalyst if fused which of the mentioned promoters?

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Iron oxide catalyst if fused which of the mentioned promoters?

(a) Alkali

(b) Non-ferrous metal oxides

(c) Al2O3

(d) All of the mentioned

The question was asked by my school principal while I was bunking the class.

This interesting question is from Inorganic Chemical in section Inorganic Chemical Industries of Chemical Technology

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Correct answer is (d) All of the mentioned

To elaborate: NH3 synthesis catalysts are based on iron oxide promoted by alkali or non ferrous metal oxides such as K2O and Al2O3.

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