The results indicated that coalification under these experimental conditions appeared to have similar evolutionary pathways regardless of the original stage; the quantity and the composition of products, however may vary during the coalification process. In this study, the difference mainly occurred during the process from peat to high volatile bituminous coal, which generated a large amount of CO2 and bitumen that contained over 95 % polar compounds. This study also demonstrated that early-stage coalification occurred mainly as a loss of oxygen in organic matter. Results of this comparative study enhanced our understanding of the mechanisms of coalification.
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