1. A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Science, 29. Leninsky Prospect, 119991 Moscow, Russia
2. Kh.M. Berbekov Kabardino-Balkarsky State University, Chernyshevsky Str. 273, 36000 Nal’chik, Russia
3. M.V. Lomonosov Institute of Fine Chemical Technology, Russian Technological University, 78. Vernadsky Avenue, 119454 Moscow, Russia