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

Abstract

Atmospheric-pressure temperature-programmed reduction (t.p.r.) was used to follow in pyrolysed subbituminous coal the changes in amount of pyrite and in organic sulfur groups as a function of temperature. At higher pyrolysis temperatures, pyrite and aliphatic and mixed aliphatic-aromatic sulfides disappeared systematically and more complex sulfur compounds such as aromatic sulfides and simple thiophenic structures were formed.