1. Department of Metallurgy and Materials Engineering, KU Leuven, Kasteelpark Arenberg 44, bus 2450, 3001 Leuven, Belgium
2. Umicore Group Research and Development, Watertorenstraat 33, 2250 Olen, Belgium
3. Department of Chemical Engineering, KU Leuven, Willem de Croylaan 46, bus 2423, 3001 Leuven, Belgium