Investigation of the relationship between coal maturity and aromaticity: Characteristics of sodium dichromate oxidation products of Australian vitrinite concentrates

摘要: Abstract The nature of the sodium dichromate oxidation products a suite 15 Australian vitrinite concentrates has been considered in an investigation relationship between aromaticity and coal maturation. For this purpose, two numerical characteristics, Δ(H/C) potential homocyclic aromatic condensation index (PHAC), were developed to describe products, which enabled relationships with commonly used indicators maturation be discerned by using simple statistical techniques. is difference H/C ratios sample unaltered structures its product. PHAC proportion molecules product vicinal carboxylic acid groups, could have formed partial some rings polynuclear structures. closest associations found fixed carbon, lower correlations maturity indicators. These support hypothesis that virtually all coals can degraded those parts completely much common, structurally, volatilized during pyrolysis.