1. VTT Technical Research Centre of Finland, Post Office Box 1000, FI-02044 Espoo, Finland
2. Pacific Northwest National Laboratory, Post Office Box 999, Richland, Washington 99352, United States
3. Thermochemical Conversion of Biomass Research Group, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium