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Why do we use Iron (Fe) as catalysis in Amination by reduction processes?

Why do we use Iron (Fe) as catalysis in Amination by reduction processes? Correct Answer All of the mentioned

A clean, finely divided, soft, gray cast iron yields the best results therefore the rate of reduction depends on the part of fineness and porosity of the iron particles, the homogeneity of the charge in the reducer, and the degree of etching imparted to the iron by the preliminary acid treatment.

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