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AssigneeResearch Triangle Institute
InventorsSantosh Kumar Gangwal, Brian Scott Turk, Raghubir Prasael Gupta
Estimating the term…
Zinc oxide-based sorbents, and processes for preparing and using them are provided. The sorbents are preferably used to remove one or more reduced sulfur species from gas streams. The sorbents comprise 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 (ZnAl2O4) 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, comprising a precipitated zinc oxide precursor and a precipitated aluminum oxide precursor, to the two-phase, active zinc oxide containing component.
A fluidizable, attrition resistant sorbent for removing at least one reduced sulfur species from a feed stream, comprising fluidizable particles comprising an active zinc component, said active zinc component comprising a zinc oxide phase and a zinc aluminate phase, each of said phases having a crystallite size of less than about 500 Angstroms as determined by x-ray diffraction line broadening analysis.
A fluidizable, attrition-resistant sorbent for removing at least one reduced sulfur species from a feed stream, comprising fluidizable particles comprising at least about 90 wt % of an active zinc component, said active zinc component comprising a zinc oxide phase and a zinc aluminate phase, each of said phases having a crystallite size of less than about 500 Angstroms as determined by x-ray diffraction line broadening analysis, wherein said zinc oxide phase comprises at least about 10 wt % of said active zinc component.
A fluidizable, attrition-resistant sorbent for removing at least one reduced sulfur species from a feed stream, comprising fluidizable particles comprising at least about 90 wt % of an active zinc component, said active zinc component comprising a zinc oxide phase and a zinc aluminate phase, each of said phases having a crystallite size of less than about 400 Angstroms as determined by x-ray diffraction line broadening analysis, wherein said particles have a total zinc oxide content, calculated based on the combined zinc oxide of said zinc oxide phase and said zinc aluminate phase, of at least about 50 wt %, based on the weight of said active zinc component.
Dependencies are inferred from the claim text.