Abstract
The catalytic activity of natural pyrites powdered finely on the liquefaction of Taiheiyo coal has been investigated. By powdering finely natural pyrites, their catalytic activities on coal liquefaction are enhanced, and their coal conversions are comparable to that in the presence of synthetic pyrite. The effect of their composition on coal conversion is reduced.According to the chemical structural analysis of oil and asphaltene produced in the presence of natural pyrite powdered finely, their carbon aromaticities are lower and their mean length of side chains (Ho/Hα + 1) are longer comparing with those in the presence of synthetic pyrite. These results indicate that natural pyrite powdered finely has a higher activity in the hydrogenation of asphaltene and in the hydrocracking of asphaltene to oil comparing with synthetic pyrite. Among four natural pyrites, pyrite from Shiraoi area (Hokkaido) has the highest hydrogenation ability to produce oils containing the most aliphatic components due to catalytic abilities of mineral matter coexisted.
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