In situ examination of the Fe species in the Argonne Premium Coal Samples using x-ray absorption spectroscopy

摘要

Elucidation of the inorganic materials within coals is important for coal processing, since these compounds may function as in situ catalysts for coal liquefaction. In addition, these species will have to be separated from the organic species prior to the use of coal as a fuel or chemical feedstock. In recent years, x-ray absorption spectroscopy (XAS) has been used to probe the trace transition metals which are contained within the matrix of coals, as well as the nitrogen and sulfur functionality within organic coal constituents. Here we present results of XAS studies, both near edge (XANES) and extended fine structure (EXAPS), on the iron species present within eight Argonne Premium Coal Samples (APCS). We compare the results from XAS with those previously found by Moessbauer spectroscopy for the Argonne premium coals.