Vitrinite secondary fluorescence: Its chemistry and relation to the development of a mobile phase and thermoplasticity in coal |
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| Institution: | 1. Moe Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University, Xi''an 710049, China;2. Graduate School of Advanced Technology and Science, Tokushima University, Tokushima 770-8501, Japan;3. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China;4. School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China;5. Energy Engineering Research Laboratory, The Central Research Institute of Electric Power Industry, Kanagawa 240-0196, Japan;6. Department of Mechanical Engineering, Kyushu University, Fukuoka 819-0395, Japan;1. School of Chemistry, Monash University, Clayton, Victoria, 3800, Australia;2. Faculty of Pharmacy, Zarqa University, Zarqa, 13132, Jordan;3. Department of Chemistry, School of Science, The University of Jordan, Amman, 11942, Jordan;4. Fuels Science Consulting, 6635 Via Dante, Lake Worth, FL, 33467, USA;5. The Sentient Group, Suite 1, Level 17, 1 Castlereagh St, Sydney, NSW, 2000, Australia;1. National Center for Compositional Characterization of Materials (NCCCM), Bhabha Atomic Research Centre, Department of Atomic Energy, Hyderabad 500 062, India;2. National Metallurgical Laboratory, Jamshedpur 831 007, India |
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| Abstract: | Coal fractions obtained by a progressive solvent extraction scheme and HPLC (high-performance liquid chromatography) fractionation have been examined by fluorescence microscopy. The results show that aromatic oligomers, polar compounds and a small portion of aliphatics in the mobile phase are actively and highly fluorescent. It is concluded that these compounds are fluorophors responsible for the secondary fluorescence displayed by some vitrinite. The overall secondary fluorescence of vitrinite is a complex overlapping of the fluorescence signals of these compounds with intermolecular and interphase interactions. These interactions cause a certain degree of fluorescence quenching through radiationless processes.The aromatic network system within the vitrinite is apparently too condensed to display a visible fluorescence at a rank higher than subbituminous C/B as a result of self-quenching. It is suggested that the development of a ‘mobile phase’ during the bituminous stage of coalification is responsible for the secondary fluorescence of the vitrinite, as well as its thermoplastic behavior. |
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