Abstract

A relation between coal organic structure and the products of thermal decomposition was developed by measuring and modeling vacuum devolatilization of 12 bituminous coals and a lignite. The distribution of devolatilization products is related to the concentration of aromatic and aliphatic carbons and hydrogens, and oxygen functional groups. Structure information on the coals, tars, and chars was provided by 1R spectra obtained with a Fourier transform infrared spectrometer (FTIR). Quantitative determinations of aromatic and aliphatic hydrogens and hydroxyl oxygens can be made from the IR spectra, and concentrations of aromatic and aliphatic carbons and ether oxygens may be inferred. These quantities may be used to predict the time-dependent evolution of thermal decomposition products by using kinetic constants that depend on the functional group but are independent of coal rank.

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