The production of H-2 by oxidation of FeO, taken here as model compound for steel slags, has been investigated both in pure water and under acidic aqueous conditions in the 373 -573 K temperature range. Whereas after 65 h, H-2 yield was negligible in pure water at 423 K, the reaction 3 FeO(s) + H2O(l) -> Fe3O4(sc) + H-2(aq) reached near completion at the same temperature within 10 h in a solution containing 0.05 mol/l acetic acid. Increasing acetic acid concentration by one order of magnitude did not yield significantly more H-2. At identical initial pH, acetic acid was found to be more efficient than oxalic acid and hydrochloric acid at enhancing H-2 production. Acidic conditions increased FeO dissolution kinetics and, consequently, improved H-2 yield. The specific efficiency of acetic acid resides in its thermal stability as well as in the potential of ligand-promoted Fe(II) dissolution. We show that the positive kinetics effect of mild acetic acid solutions over H-2 yield evidenced on FeO does not apply directly to steel slags which buffer the pH to high values due to the presence of large amounts of CaO. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.