01619nab a2200205 4500 20260520000927.0 260224s2011 xxu X-ray photoelectron spectroscopy (XPS) investigation of nitrogen functionalities during coal char combustion in O2/CO2 and O2/Ar atmospheres ene./feb. 2011 04/04/2011 ; 04/04/2011 6 p. ; 240–245 Transcripción del resumen del autor. The development of nitrogen functionalities during Datong bituminous coal pyrolysis under severe conditions was investigated by X-ray photoelectron spectroscopy (XPS). The evolutions of the nitrogen functionalities in char as a function of burnoff during high-temperature char (1173 K) combustion in O2/CO2 and O2/Ar atmospheres were also studied. Pyrrolic nitrogen is completely converted into quaternary and pyridinic nitrogen upon severe pyrolysis (1173 K for 2 h). More severe pyrolysis (1473 K for 2 h) results in a conversion of quaternary nitrogen into pyridinic nitrogen. During char combustion, quaternary nitrogen is transformed into pyridone and pyridinic nitrogen in both of the atmospheres. The CO2 gasification has a small effect on the evolution of nitrogen functionalities but has a significant influence on the char combustion rate. The char combustion rate is faster in an O2/CO2 atmosphere than in an O2/Ar atmosphere. 1 Energy & fuels 25 ARTICULO Zhang, Yongchun 45036 Zhang, Jun 18025 Sheng, Changdong 18023 174398 174398 0 0 0 0 242217 BAAB BAAB 2026-03-05 200052414 0 200052414 2026-03-05 16:11:49 2026-03-05 ARTICULO