An efficient absorbent of hydrogen sulfide for hot-gas cleaning was developed. In order toincrease the efficiency of the absorbent, activated carbon-supported ferrite was prepared and theabsorption behavior of the absorbent was examined using a fixed bed reactor and athermogravimetric balance.Activated carbon-supported ferrites could be prepared at a much lower calcination temperature(400 °C) than the typical preparation temperature of ca. 1000 °C for a dry process. These ferriteshave high surface areas up to 663 m~2/g. Breakthrough behavior was obtained with a fixed-bed flowreactor, with almost complete absorption of hydrogen sulfide from 5000 ppm to nearly zero levelbeing achieved at an absorption temperature of 400 °C. Utilization of Zn and Fe reached nearly100 %, but ferrite prepared without activated carbon in a similar manner, afforded metal utilizationefficiency of about 50 %. The results obtained with a thermogravimetric balance indicated that theinitial hydrogen sulfide absorption rate of the activated carbon-supported ferrite was about tentimes higher than that of the ferrite prepared by the dry process. Regeneration of activatedcarbon-supported zinc ferrite can successfully achieve.
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