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Zinc oxide-based sorbents and processes for preparing and using same

United States Patent

October 4, 2005
View the Complete Patent at the US Patent & Trademark Office
Zinc oxide-based sorbents, and processes for preparing and using them are provided, wherein the sorbents are preferably used to remove one or more reduced sulfur species from gas streams. The sorbents contain an active zinc component, optionally in combination with one or more promoter components and/or one or more substantially inert components. The active zinc component is a two phase material, consisting essentially of a zinc oxide (ZnO) phase and a zinc aluminate (ZnAl.sub.2 O.sub.4) phase. Each of the two phases is characterized by a relatively small crystallite size of typically less than about 500 Angstroms. Preferably the sorbents are prepared by converting a precursor mixture, containing a precipitated zinc oxide precursor and a precipitated aluminum oxide precursor, to the two-phase, active zinc oxide containing component.
Gangwal; Santosh Kumar (Cary, NC), Turk; Brian Scott (Durham, NC), Gupta; Raghubir Prasad (Durham, NC)
Research Triangle Institute (Research Triangle Park, NC)
10/ 670,206
September 26, 2003
This invention was made with Government support under Contract No. DE-AC26-99FT40675 awarded by the U.S. Department of Energy (DOE). The United States Government has certain rights in this invention.