Further development of aromatic ring size above 500 deg C in the heat-treatment of coking coals

摘要

In order to discuss the difference of thermal behavior of a strongly coking coal, GNY coal, and a slightly coking coal, ENS coal, the heat-treatment of the two kinds of coal up to 500, 600 and 700 deg C was conducted. The resulting semi-coke samples were analyzed by solid-state NMR and submitted to ruthenium ion catalyzed oxidation reaction. The results from both experiments indicated that GNY-derived semi-coke samples had larger aromatic rings than ENS-ones. Integrated schematic images for structural changes after resolidification were proposed.