X-ray photoelectron spectroscopy (XPS) investigation of nitrogen functionalities during coal char combustion in O2/CO2 and O2/Ar atmospheres
Zhang, Yongchun Zhang, Jun Sheng, Changdong
X-ray photoelectron spectroscopy (XPS) investigation of nitrogen functionalities during coal char combustion in O2/CO2 and O2/Ar atmospheres - ene./feb. 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
X-ray photoelectron spectroscopy (XPS) investigation of nitrogen functionalities during coal char combustion in O2/CO2 and O2/Ar atmospheres - ene./feb. 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
