1. Max-Planck-Institut für Kohlenforschung; Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Germany
2. Institute of Chemistry; State University of Campinas; P.O. Box 6154 13083-970 Campinas, SP Brazil
3. Department of Chemical Engineering; Imperial College London; South Kensington Campus SW7 2AZ London United Kingdom