中阶煤结构跃变的构造煤IR证据

oal is a pressure-sensitive organic rock. Tectonism effecting to the structure evolution of middle-rank coal has been confirmed by the crystalline-structure changes of tectonic coal, but the response at the molecular level of coal organic matter hasn't been reported. With the infrared spectra technique and peak unfolding method, this paper carried out a comparative study on the structure and/or composition' IR response of three sets of middle-rank tectonic coal and its symbiotic un-tectonic coal, and revealed the characteristics and mechanism of their structure jump. The main points include: Compared with the symbiotic un-tectonic coal, the tectonism accelerates the side chain' shedding of coal macromolecular structure, the aromatic system increasing and the unstable groups like hydrogen bond first removing, and leads to tectonic coals significant advance evolution characteristics; The aromatic-ring condensation is clear during fat coal grade tectonic coal forming because of the side chains removal, cycloaliphatic dehydrogenation aromatization exists mainly during coking coal grade tectonic coal forming accompanied by the aromatic-ring condensation, and lean coal grade tectonic coal shows aromatization characteristics significantly; The molecular depolymerization and chemical tailoring caused by the tectonism promotes the hydrophobic-side-chain shedding in coal, and activates some polar points in coal structure. It is believed that the structure jump of middle-rank tectonic coal came from the competition between aromatic system and aliphatic structure.?????