Abstract: Using FeSO₄.7H₂O as raw material, iron-based catalysts for coal hydrogenation liquefaction were prepared by precipitation-oxidation method under different conditions. The catalysts were characterized by XRD, SEM and N₂ absorption-desorption, and the effects of preparation temperature, preparation time and iron-coal mass ratio on the crystal phase composition, distribution and activity of the catalysts were investigated. The results showed that the crystallinity of α-FeOOH and γ-FeOOH was increased with the increase of preparation temperature, and further increased the preparation temperature, the crystal phase of the catalyst was transformed to γ-Fe₂O₃ with low activity. The crystallinity of α-FeOOH and γ-FeOOH crystal phases in the catalyst can be improved by increasing the preparation time, but a small amount of γ-Fe₂O₃ crystal phase will be generated by prolonged preparation time. Small iron-coal mass ratio is conducive to the formation of α-FeOOH and γ-FeOOH crystal phases, but the ratio too small, the crystallinity of α-FeOOH and γ-FeOOH will be decreased, and the ratio too large, γ-Fe₂O₃ will be formed.

Key words: precipitation-oxidation method, coal supported iron catalyst, preparation condition, liquid yield, crystalline phase