The hydrolysis experiments were performed using deionised water and aqueous solutions of organic acids: acetic (AA; 99.8% purity), citric (CA; 99.5%) and oxalic (OA; 99.5%). Summary of main properties of the acids and their magnesium salts, along with concentrations of the used reaction solutions is presented in Table . The measurements of hydrogen evolution during hydrolysis were carried out using inhouse built volumetric setups schematically shown in Figure ).