Abstract
The performance of zinc ferrite promoted with V 2 O 5 was investigated as a hot gas desulfurization sorbent. The sorbents were prepared by the incipient impregnation technique, and the vanadium loading and the calcination temperature were varied. The sorbents were tested in a packed-bed microreactor set-up for five sulfidation-regeneration cycles to investigate their breakthrough behaviour. Sulfidation was performed at 873–973 K with H 2 S-H 2 -H 2 O-N 2 mixtures, while regeneration was carried out at 923–973 K with O 2 -N 2 mixtures. The fresh, sulfided, and regenerated sorbents were characterized by atomic absorption spectroscopy, X-ray diffraction, surface area and porosity measurements. The results of the investigation indicated that the sorbents exhibited a more stable cyclic performance with higher vanadium loading, all vanadium-promoted sorbents reduced the H 2 S content of the gas to levels below the equilibrium level for zinc oxide, some H 2 S was chemisorbed by vanadium, and two-step calcination imparted structural stability to the sorbents.
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