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Three coals from South China, having high contents of vitrinite, liptinite, hydrogen, volatile matter, and high H/C atomic ratios, were subjected to liquefaction in tubing-bomb microreactors at 430°C for 1h with tetralin, hydrogen, and iron sulfate catalyst. The optical characteristics of the liquefaction residues were studied by white-light and fluorescence microscopy. A comparative study on the...
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