1. Max-Planck-Institut für Kohlenforschung; Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Germany
2. Department of Chemical Engineering; Imperial College London; South Kensington Campus London SW7 2AZ UK
3. Laboratory of Industrial Chemistry; Åbo Akademi University, Turku; Biskopsgatan 8, FIN- 20500 Turku/Åbo Finland