Durable zinc oxide-containing sorbents for coal gas desulfurization
AssigneeThe United States of America as represented by the United States Department of Energy
InventorRanjani V. Siriwardane
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Abstract
Durable zinc-oxide containing sorbent pellets for removing hydrogen sulfide from a gas stream at an elevated temperature are made up to contain titania as a diluent, high-surface-area silica gel, and a binder. These materials are mixed, moistened, and formed into pellets, which are then dried and calcined. The resulting pellets undergo repeated cycles of sulfidation and regeneration without loss of reactivity and without mechanical degradation. Regeneration of the pellets is carried out by contacting the bed with an oxidizing gas mixture.
Claims7
Sorbent pellets containing titanium oxide for removing hydrogen sulfide from a gas stream at a temperature of 800.degree. F. to 1,200.degree. F. comprising a mixture of the following components, in weight percent:
- zinc oxide--30 to 60
- titanium oxide--less than 40
- silica gel--5 to 40
- Bentonite--2 to 15
- calcium sulfate--2 to 15
- said mixture having been moistened with water, compressed into pellets, dried, and calcined under conditions wherein formation of zinc titanate is avoided.
Dependencies are inferred from the claim text.