Abstract
The high-temperature, regenerable, desulfurization sorbents under development at METC for use in advanced power systems incorporating coal gasification have been designed to operate at temperatures upwards of about 538 C (1,000 F). This temperature has been thought to be optimal, taking into account such factors as higher sorbent reactivity, increased thermodynamic efficiency, and regeneration temperature. Recent revision of total system considerations indicates that, in certain circumstances, it may be desirable to operate these sorbents at lower temperatures because of materials considerations. Therefore, a small laboratory investigation of the desulfurization performance of zinc ferrite, one of the sorbents under development, was conducted in the temperature range 315 to 538 C. Reduction of zinc ferrite (i.e., ZnFe{sub 2}O{sub 4} {yields} Fe{sub 3}O{sub 4} + ZnO) is necessary for good desulfurization; reduction caused formation of zinc oxide and magnetite of smaller crystallite size than original zinc ferrite; reduction of zinc ferrite caused a significant increase in small pore porosity; and zinc ferrite can be used below 538 C (1,000 F) if an initial reduction is carried out.
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