Some signs pointed to ammonium illite as the probable form of inorganic nitrogen, which may provide another piece of evidence for the new viewpoint of the volcanic and/or hydrothermal origin of SHOS coals. In an uncommon manner, inorganic oxidized nitrogen, instead of pyrrolic and pyridinic nitrogen, was the predominant nitrogen form in the SHOS coals with only bituminous rank. The nitrogen contents of the SHOS coals from southern China were much lower than expected. The aromatic fraction of organic sulfur increased with the increasing carbon content and was inversely proportional to aliphatic sulfur, indicating that the relative abundance of thiophenic and thiol sulfur compounds were probably related to the coal rank. Twenty-five high-organic-sulfur coal samples of the Late Paleozoic from China were reported, fourteen of which were superhigh organic sulfur (SHOS) coals collected from southern China with organic sulfur contents >8% (on dry and ash-free basis). The chemical states of sulfur and nitrogen in high-sulfur coals were investigated via X-ray photoelectron spectroscopy (XPS).
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