Fourier transform infrared study of the variation in the oxidation of a coking coal

Role of preasphaltenes in coal conversion reactions. First quarterly report, year two

“…Until then, these coals from the Wasatch Plateau field (Uinta Inspection of the pyrolysis mass spectra in Figure 6 shows the structural effects of weathering to be dominated by a decreased yield of phenolic and naphthaleneic moieties and a relative increase in the yield of aliphatic carboxylic and carbonylic moieties, as further illustrated by the scatter plots of selected peak intensities in Figure 7. These findings are in excellent agreement with current vicw5 on chemical effects of coal weathering according to which the process is characterized by the formation of ether bridges between aromatic nuclei, with concurrent reduction in free phenolic hydroxyl groups [3], and by the oxidation of aliphatic moieties to carbonylic and carboxylic functional groups [4].…”

Chemistry and Structure of Coals

“…Painter, et al, have studied coal oxidation both for samples obtained from various areas in a vein exploration audit through a high volatile coking coal seam (8) and in laboratory studies at low temperature (100°C) (9). It was concluded from this work that a variety of carbonyl, carboxylic acid, and carboxylate containing products are formed in the oxidation process.…”

“…Fourier transform infrared (FTIR) spectroscopy has been used extensively in the past several years in the study of coal and its related products (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13). The majority of this work has been done by transmission spectroscopy utilizing the KBr pellet technique.…”

Role of preasphaltenes in coal conversion reactions. Second quarterly report, year two

“…Pyrolysis mass spectrometry (Py-MS) analysis of fresh and weathered hvb coal samples and detailed examination of weathering effects. 4. Py-MS comparison of vacuum and pyridine extracts and SCT tubing bomb reactor products from fresh and weathered coals.…”