DETERMINATION OF SULFUR GROUPS IN PYROLYZED LOW-RANK COAL BY ATMOSPHERIC-PRESSURE TPR

Atmospheric-pressure temperature-programmed reduction (t.p.r.) was use d to follow in pyrolysed subbituminous coal the changes in amount of p yrite and in organic sulfur groups as a function of temperature. At hi gher pyrolysis temperatures, pyrite and aliphatic and mixed aliphatic- aromatic sulfides disappeared systematically and more complex sulfur c ompounds such as aromatic sulfides and simple thiophenic structures we re formed.