The chemistry of char-N release and conversion to nitrogen-containing products has been probed by studying its release and reactions with O2 and CO2. The experiments were performed in a fixed bed flow reactor at pressures of up to 1.0MPa. The results show that the major nitrogen-containing products observed depend on the reactant gas; with O2

NO

and N2 being the major species observed. Char-N reaction with CO2 produces N2with very high selectivity over a broad range of pressures and CO2 concentrations. Observed distributions of nitrogen-containing products are little affected by pressure when O2 and CO2are the reactant gases. The results suggest that NO and HCN are primary products when O2 is used as the reactant gas

and that the other observed products arise from interactions of these primary products with the char surface.