Two samples of coals coming from South Africa and Sulcis (Sardinia, Italy) were subjected to
progressive heating up to 800° C in vacuum. The infrared (IR) spectra of the residuals
obtained at 100° C intervals from room temperature to 800° C show spectral changes
ascribed to transformations at the level of the organic and inorganic components.
Comparing these results with those previously obtained by heating the same coals in the
presence of air and examining their pyridinic extracts, it appears that the Sulcis coal with …

The analysis of gas evolving during the pyrolysis of two very different rank coals was studied
by using FT‐IR spectroscopy. These coals, coming from Sulcis (Sardinia, Italy) and from
South Africa, respectively, were subjected to progressive heating up to 800° C in vacuum.
The thermal destruction of coal was followed by monitoring the production of gases in this
range of temperature. The gases evolving in the heating from room temperature to 800° C
were collected at intervals of 100° C and analysed by infrared spectroscopy. The relative …