Abstract
The amount of hydrogen evolved from a coal during pyrolysis at atmospheric pressure in the presence of coal hydroliquefaction catalysts can be used to compare the activity of different catalysts for the highpressure hydrogenation of coals. This technique has now been used to compare the variation in the effectiveness of MoO 3-TiO 2, and Fe 2O 3-SO 2− 4, as hydroliquefaction catalysts with change in coal rank. It is indicated that coals with carbon contents of ≈ 82 wt% are the most amenable to hydroliquefaction at high pressure.
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