1. Department of Chemical Engineering, Imperial College London, London SW7 2AZ, U.K.
2. Cardiff Catalysis Institute, Cardiff University, Park Place, Cardiff CF10 3AT, U.K.
3. Biobased Chemicals R&D, Haldor Topsøe A/S, Haldor Topsøes Allé 1, 2800 Kgs. Lyngby, Denmark