Abstract
Mossbauer spectroscopy, XAFS spectroscopy, and a number of complementary techniques have been used to investigate the structure and size dispersion of a variety of ultrafine iron-based DCL catalysts. In the as-prepared state, iron that was chemically incorporated into the coal exhibited an FeOOH structure, while iron catalysts prepared separately had the Fe 2 O 3 structure. The Mossbauer spectra exhibited pronounced superparamagnetic relaxation effects. The relaxation spectra could be analyzed at several temperatures to determine size distributions for the catalyst particles. The resulting size distributions were in the nanometer range and agreed reasonably well with size information obtained by SQUID magnetometry, STEM, and XRD
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