1. School
of Science and Technology, Hellenic Open University, Tsamadou
13-15, GR-26222 Patras, Greece
2. Department
of Chemistry, University of Patras, GR-26500 Patras, Greece
3. Institute of Chemical Engineering and High-Temperature Chemical Processes (FORTH/ICE-HT), P.O. Box 1414, GR-26500 Patras, Greece