The application of modified cenospheres in DeNOx process Bogdan Samojeden, Teresa Grzybek, Agnieszka Szymaszek, Oliwia Ligęza, Wioletta Kowalczyk and Monika Motak E3S Web Conf., 108 (2019) 02019 Published online: 05 July 2019 DOI: 10.1051/e3sconf/201910802019