PYROLYSIS-GAS CHROMATOGRAPHY OF SOME COALS BY NITROGEN AND PHOSPHORUS, FLAME IONIZATION AND MASS-SPECTROMETER DETECTORS

Pyroprobe pyrolysis technique was applied to some coals with very diff erent geographic origins. The pyroprobe was coupled to a gas chromatog raph and the products were detected using different systems: mass spec trometry (MS), nitrogen and phosphorus selective detector (NPD) or fla me ionisation detector (FID). The MS data permitted the identification of most of the pyrolysis products. The production of nitrogen bearing compounds was studied with NPD data, and the amount of all pyrolysis products with FID data. This data was also used for principal componen t analysis and the results for a hierarchic cluster analysis which sug gests a classification of coals. (C) 1997 Elsevier Science B.V.