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Can we use sponge iron as catalyst in Haber's process? 

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The Fe3N nanoparticle sponge is shown to be a promising catalyst for ammonia decomposition, an easy process for CO2-free hydrogen supply and off-gas treatment.
Finally, we can deduce that Fe2O3 prepared using iron chloride as a precursor may be safely used as an efficient catalyst for NC.
The process cycle sponge iron/hydrogen/iron oxide offers a simple possibility to store the energy of synthesis gases in the form of sponge iron, and at the same time to reform and to condition these synthesis gases.
If iron oxide and carbon can be used as a catalyst, they would have a low environmental influence and a relatively low cost.
This became the first new catalyst for ammonia synthesis to be commercialised since Fritz Haber’s promoted iron catalyst.
Significantly, the sponge iron anode could generate Fe(VI) for a long duration (>10h) under these conditions; possibly suitable for large scale synthesis of Fe(VI).
The investigations discussed in this paper provide quantifiable proof that the iron sponge process continues to be a viable alternative for hydrogen sulfide and mercaptan removal, provided the sweetening equipment is properly designed and operated.
Sponge iron (s-Fe0) is a potential alternative electron donor for nitrate reduction.
This indicates that bog iron is the most suitable catalyst in the fluid bed reactor.
The significance of this approach includes the use of earth-abundant iron, the fast and simple method for catalyst preparation, the low catalyst loading, and the large TOF for O2 evolution in neutral aqueous media.

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