Chemical Changes of Australian Coking Coals from Different Basins with Various Ranks and Maceral Compositions: Linking to Both Physical and Thermal Changes

摘要: Chemical changes of eight Australian coking coal samples from six different basins with various ranks (RvMax 0.87 to 1.52) and maceral constituents (vitrinite 48.2 76.5%) were dynamically investigated explore the mechanism linking synchronized physical thermal changes. Volatile release during pyrolysis was monitored using a novel technique dynamic elemental analysis (DETA) that is able differentiate tar gas evolution in terms carbon hydrogen compositions. Condensed tars characterized both chemically thermally DETA laser desorption ionization–time flight–mass spectrometry (LDI–TOF–MS) techniques. Coal experiments conducted at heating rate 5 °C/min room temperature (25 °C) 1000 °C top particle size 212 μm, which kept same experimental conditions as measurements. The results indicated that, overall, volatile rates decrease...