1. Department of Chemical Engineering, The Pennsylvania State University, 133 Fenske Laboratory, University Park, Pennsylvania 16802-4400
2. Department of Energy and Geo-Environmental Engineering, The Pennsylvania State University, 205 Hosler Building, University Park, Pennsylvania 16802
3. New University of Lisbon, Departamento de Quimica, Portugal
4. Instituto Nacional del Carbon (INCAR), C.S.I.C., Apartado 73, 33080 Oviedo, Spain