Study on Cr₂O₃/γ-Al₂O₃ Catalysts for Mixed Pyrolysis of Coal to Produce Hydrogen-Rich Fuel Gas

Abstract

γ-Al 2 O 3 was used as the carrier, the group VIII metal oxides and the sub group metal oxides were used as active components, and the γ-Al 2 O 3 catalysts were prepared by the equal volume impregnation method. Hydrogen rich fuel gas and tar products were produced by the mixed pyrolysis of coal and catalysts in a furnace. The influence of γ-Al 2 O 3 catalysts with different loading Cr 2 O 3 on the mixed pyrolysis products of coal was studied. The catalyst was characterized by ICP-MS, XRD and BET, and the pyrolysis mechanism of coal and catalyst was studied. The results showed that: 1) The tar and gas of coal pyrolysis were 0.32g and 1.58g, respectively, and the highest total contents of CO, H 2 and CH 4 were 71.40% respectively. 2) Fe 2 O 3 /γ-Al 2 O 3 catalyst made the highest tar of 0.75g, which was 16.4% higher than that of coal; Cr 2 O 3 /γ-Al 2 O 3 catalyst made the highest gas of 1.73g, which was 9.5% higher than that of raw coal.