> Interestingly, the paper mentions that the reactions do produce (some) hydrogen, which could perhaps be recaptured. The hydrogen is used for reducing the iro

> Interestingly, the paper mentions that the reactions do produce (some) hydrogen, which could perhaps be recaptured. The hydrogen is used for reducing the iron oxides, that's the whole point of the process! That is, FeXOY + H2 => Fe + H2O