1. School
of Mechanical Engineering, Korea University, Seoul 136-713, Republic of Korea
2. Department of Chemistry, University of Torino, Via P. Giuria 7, 10125, Torino, Italy, and Consorzio Interuniversitario Reattivitá
Chimica e Catalisi, Bari.
3. Petrochemical Research Chair, Department
of Chemistry, King Saud University, Riyadh 11451, Saudi Arabia
4. Department of Chemical & Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260-4200, United States