1. University of Bucharest, Faculty of Chemistry, Department of Chemical Technology and Catalysis, B-dul Republicii 13, 70346 Bucharest, Romania
2. Universite Catholique de Louvain, Unite de Catalyse et Chimie des Materiaux Divises, Place Croix du Sud, 2/17, 1348 Louvain-la-Neuve, Belgium