Abstract:

The influence of Ag loading on the activity of Ag/γ-Al₂O₃ catalyst with variable Ag loading prepared by equivalent volume impregnation method to catalyze the hydrogenation of coal slime was investigated. The structure of the catalyst was analyzed by XRD, TPR, XPS and SEM. Experiment shows that there is little difference in the catalytic activities of Ag/γ-Al₂O₃ with varying Ag loading in a range of 600~900 ℃. However, when Ag loading was 5%, the activity of Ag/γ-Al₂O₃ increased in a range of 900~1 100 ℃. The XRD and SEM analyses show that when Ag loading in Ag/γ-Al₂O₃ was 5%, the Ag loading species were well dispersed in the carrier. The investigations of H₂-TPR show that the reduction peak of 5% Ag/γ-Al₂O₃ did not exist; the results indicate that 5% Ag/γ-Al₂O₃ has been completely reduced to elemental sliver.

Key words: coal slime； pyrolysis； supported catalyst； making hydrogen