1. Schuit Institute of Catalysis, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands, Interfacultair Reactor Instituut, Mekelweg 15, 2629 JB Delft, The Netherlands, and National Centre for HREM, Rotterdamseweg 137, 2628 AL Delft, The Netherlands