Experimental and DFT research for the effects of sodium on the heterogeneous reaction between NO and semichar derived fromO2/CO2 pretreatmentsLei Zhang, Rui Sun, Zhuozhi Wang and Mengfan YuanE3S Web of Conf., 406 (2023) 01004DOI: https://doi.org/10.1051/e3sconf/202340601004