3D-O1-1010 PDF
Characterization of pyrolysis products from coals by evolved gas anaysis using
We performed evolved gas analysis (EGA) in the thermal decomposition of coals with a photoionization mass spectrometer (PI-MS). High intensity ion signals at m/z = 94, 108 and 142 assigned to phenol, cresol, and naphthalene, respectively were observed at heating temperature above 320 deg C. These compounds exhibit bimodal distributions as a function of heating temperature and would be produced by cracking of higher-molecular-weight compounds. High-molecular-weight components above 200 were not obviously measured because of the thermal decomposition in the elevated temperature.