Study on Cr2O3/γ-Al2O3 Catalysts for Mixed Pyrolysis of Coal to Produce Hydrogen-Rich Fuel Gas
Li Yue 1
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Shaanxi Coal Geological Laboratory Co.,Ltd., Xi’an, 710054, China
Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Natural Resources, Xi’an, 710021, China
Xi’an University of Science and Technology, Xi’an, 710054, China
Chen Jihao   

Shaanxi Coal Geological Laboratory Co.,Ltd, 457 710054, Xi`an, China
Submission date: 2021-03-04
Final revision date: 2021-04-02
Acceptance date: 2021-04-13
Online publication date: 2021-12-16
Publication date: 2022-01-28
Pol. J. Environ. Stud. 2022;31(1):701–711
γ-Al2O3 was used as the carrier, the group VIII metal oxides and the sub group metal oxides were used as active components, and the γ-Al2O3 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-Al2O3 catalysts with different loading Cr2O3 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, H2 and CH4 were 71.40% respectively. 2) Fe2O3/γ-Al2O3 catalyst made the highest tar of 0.75g, which was 16.4% higher than that of coal; Cr2O3/γ-Al2O3 catalyst made the highest gas of 1.73g, which was 9.5% higher than that of raw coal. 3) The Cr2O3/γ-Al2O3 catalyst prepared by loading 1% Cr2O3 had better catalytic effect. 4) The the specific surface areas of Cr2O3/γ-Al2O3 and γ-Al2O3 were similar, while the catalytic cracking effect of Cr2O3/γ-Al2O3 was more obvious than that of γ-Al2O3, so Cr2O3 improved the catalytic activity.