1. Department of Chemistry and Chemical Engineering, Competence Centre for Catalysis, Chalmers University of Technology, 412 96 Göteborg, Sweden
2. Centre for Analysis and Synthesis, Lund University, 221 00 Lund, Sweden
3. Johnson Matthey Technology Centre, Blounts Court, Sonning Common, Reading RG4 9NH, U.K.
4. Johnson Matthey AB, 421 31 Västra Frölunda, Sweden