1. Department of Chemical Engineering; Dong-A University; Busan 604-714 Republic of Korea
2. Department of Energy Engineering; Hanyang University; Seoul 133-791 Republic of Korea
3. Italian Institute of Technology; Genova, Italy and King Abdulaziz University; Jeddah Saudi Arabia
4. Chemistry Department; Faculty of Science; King Abdulaziz University; Jeddah 21589 Saudi Arabia