1. Faculty of Fuels and Energy, University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Kraków, Poland; Institute of Automatics, University of Mining and Metallurgy, Al. Mickiewicza 30, 30−059 Kraków, Poland; and Research Institute of Applied Chemistry, Miskolc University, POB 2, 3515 Miskolc-Egyetemváros, Hungary