1. Energy Engineering, Division of Energy Science, Luleå University of Technology, SE-971 87 Luleå, Sweden
2. Thermochemical Energy Conversion Laboratory, Department of Applied Physics and Electronics, Umeå University, SE-901 87 Umeå, Sweden
3. BEST—Bioenergy and Sustainable Technologies GmbH, Inffeldgasse 21b, A 8010 Graz, Austria