Table 3.

Theoretical direct CO₂ emissions per kg of produced iron for different reducing agents.

Reducing agent	Main reaction	CO2 emissions (kg/kg Fe)
Coke (CO)	3CO(g) + Fe2O3(s,l) $\to$ 2Fe(l) + 3CO2(g)	1.18
CH4 (CO/H2)	2H2(g)+CO(g)+Fe2O3 $\to$ 2Fe(s) + 2H2O(g) +CO2(g)	0.39
H2	3 H2(g)+Fe2O3(s) $\to$ 2Fe(s) + 3H2O(g)	0
Electron	2Fe2O3(l) $\to$ 4Fe(l) +3O2(g)	0