1. Department of Inorganic, Physical and Materials Chemistry, NIS Centre of Excellence and INSTM Reference Center, University of Turin, Via P. Giuria 7, I-10125 Torino, Italy
2. Chimet SpA - Catalyst Division, Via di Pescaiola 74, Viciomaggio Arezzo, I-52041 Italy
3. Consultant, Via Firenze 43, 20010 Canegrate, Milano, Italy