Determination of aromaticities and other structural features of Australian coals using solid state 13C NMR and FTIR spectroscopies

Associations of physical, chemical with thermal changes during coking as coal heats – Experiments on coal maceral concentrates

“…A number of techniques have been previously employed to investigate individual events involved in the physical, chemical and thermal changes as coal heats, for instance, Gieseler Plastometer [10,11] and Proton Magnetic Resonance Thermal Analysis (PMRTA) [12,13] for measuring fusibility and Rheometry [14][15][16] for viscosity; crucible swelling [10] and Audibert-Arnu dilatometer [10,11] for evaluating swelling; Thermogravimetric Analysis (TGA), Gas Chromatography (GC), Mass Spectrometry (MS), Fourier Transform Infrared Spectroscopy (FTIR) and Nuclear Magnetic Resonance (NMR) [9,[17][18][19][20][21][22] for analysing chemical changes; and Differential Scanning Calorimetry (DSC) [23][24][25] and Differential Thermal Analysis (DTA) [26] for estimating thermal changes.…”

Maria Coal Pyrolysis Studied by Fourier Transform Infrared and Mössbauer Spectroscopy

“…Maria coal sample was treated by HF-HCl to remove the mineral matter and to permit measurements in the aromatic C-H out of plane zone. The acid treatment at room temperature does not produce important structural changes in low rank coals as proved by the good agreement between structural parameters deduced from the solid state 13 C NMR of the raw coal and those determined from FTIR spectroscopy using demineralized samples (Ibarra et al, 1996;Sapaluknari et al, 1989).…”

Pyrolysis: Pathway to Coal Clean Technologies

“…Coal is a complex carbonaceous polymer made up of organic and inorganic substances [32,33]. The organic materials are known as macerals, while the inorganic impurities are considered as the minerals [34]. When exposed to heat-treatment; the physical, chemical, thermal, mechanical and electrical properties of coal undergo transformation [20,35].…”