Abstract
In previous papers, we reported on the catalytic activity of finely divided sulfated iron oxides for the direct liquefaction of coals containing between 0.2 and 2.5 wt% of pyrite (Energy Fuels, 1991, 5, 497-507). The addition of small amounts of sulfated iron oxide catalysts (3500-7000 ppm relative to coal) significantly improved coal conversions and oil yields in the direct liquefaction of these coals. However, the large amounts of inherent pyrite present clouded the interpretation of catalyst composition, dispersion, and activity of the added sulfated iron oxide catalysts. In this paper, we address the quantification of catalyst activity and characterization, before and after reaction, of somepreviously reported and some newly synthesized anion-modified iron oxide catalysts by using two coals with very low inherent contents of pyrite
Published Version
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