1. Clean Fuels Research Center, Korea Institute of Energy Research (KIER), 305-343 Taejon, South Korea
2. Department of Mechanical and Process Engineering, Eidgenössische Technische Hochschule Zürich (ETH Zürich), 8092 Zürich, Switzerland
3. Solar Technology Laboratory, Paul Scherrer Institute (PSI), 5232 Villigen PSI, Switzerland