With the increase of coal rank, the aromaticity of both inertinite and vitrinite increases, but the aromaticity of inertinite increases more slowly than that of vitrinite.

• 随着煤变质程度的提高，煤分子中芳构化程度不断提高，但惰质组的芳香度随变质程度变化的规律明显不如镜质组；