Fourier transform infrared spectroscopy has been used to study the evolution of the structure of a bituminous coal and its pyridine extraction products during oxidation. Different methods of analysis of the spectra have been used, such as curve-resolving routines, coupled to second derivative methods and area integration. The pyridine extract has been found to maintain the characteristic absorption bands of the original coal and to present marked susceptibility towards oxidation, to a greater extent than its parent coal. The analysis of the coal, extract and residue spectra and their comparison as oxidation proceeds, give an insight into the complex phenomena occurring. Pyridine extract spectra present a better separation of contributions of the bands involved, by the low temperature oxidation of low rank coals, particularly in the zones 3500-2800 and 1800-1500 cm-1.
LOW-TEMPERATURE AIR OXIDATION OF COAL AND ITS PYRIDINE EXTRACTION PRODUCTS - FOURIER-TRANSFORM INFRARED STUDIES
TOGNOTTI, LEONARDO;PETARCA, LUIGI;D'ALESSIO, ALDO;
1991-01-01
Abstract
Fourier transform infrared spectroscopy has been used to study the evolution of the structure of a bituminous coal and its pyridine extraction products during oxidation. Different methods of analysis of the spectra have been used, such as curve-resolving routines, coupled to second derivative methods and area integration. The pyridine extract has been found to maintain the characteristic absorption bands of the original coal and to present marked susceptibility towards oxidation, to a greater extent than its parent coal. The analysis of the coal, extract and residue spectra and their comparison as oxidation proceeds, give an insight into the complex phenomena occurring. Pyridine extract spectra present a better separation of contributions of the bands involved, by the low temperature oxidation of low rank coals, particularly in the zones 3500-2800 and 1800-1500 cm-1.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
