Two Sydney Basin Bulli coals with differing coking properties are compared and characterised by thermal desorption and pyrolysis-GC/MS analyses. From the TD-GC/MS data a series of maturity indicators have been calculated and from the MPI-1 the calculated vitrinite reflectances have been obtained. On the basis of these maturity indicators, the two Australian coals compare well with a suite of northern hemisphere coals. Continuous flow centrifugation has been used to separate one coal (Bulli A) on a large scale into highly pure vitrinite and inertinite maceral fractions enabling comparative data to be obtained. The inertinite is distinguished from the vitrinite by the quantitative differences of many components released on pyrolysis. Bulli A can also be distinguished from Bulli B coal on a similar basis. The inertinite fraction gives a yield of volatiles 54% of that released from vitrinite and unexpectedly releases high proportions of n-alkanes and n-alkenes at 600°C pyrolysis. © 1991.
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