Abstract
The effect of the molar ratio of Mn:Fe on Mn–Fe/γ-Al 2O 3 sorbent performance for hot gas desulfurization was studied in detail in this paper. The results showed that the ideal composition for preparation of Mn–Fe/γ-Al 2O 3 was a molar ratio of two, i.e. AMF2.0 sorbent, for the temperature range of 500–650 °C. The regenerated AMF2.0 sorbent desulfurization results showed that its reactivity was decreased when the reaction–regeneration cycles were more than seven at 700 °C, using 3.0 vol.% oxygen diluted with nitrogen as regeneration conditions. When a small amount of ZnO was added to the AMF2.0 sorbent, its performance in removal of H 2S was improved at the experimental conditions. The optimum composition for preparation of Mn–Fe–Zn/γ-Al 2O 3 was a 2:1:0.2 molar ratio of Mn:Fe:Zn, i.e. AMFZ0.2 sorbent. At the same regeneration conditions used for Mn–Fe/γ-Al 2O 3 sorbents, it was shown that the regenerated AMFZ0.2 sorbent had better desulfurization stability, which implied the AMFZ0.2 sorbent could be an ideal sorbent for removal of H 2S at high temperature for hot gas desulfurization.
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