1. UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide; Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois; F-59000 Lille France
2. Laboratory of Physical Chemistry of Materials (LCPM)/PR2N; Faculty of Sciences; Lebanese University, Fanar; BP 90656 Jdeidet El Metn Lebanon