Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Reexamination Certificate
2005-10-04
2005-10-04
Silverman, Stanley S. (Department: 1754)
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
C423S230000, C423S244100, C502S414000, C502S504000, C502S514000, C502S517000
Reexamination Certificate
active
06951635
ABSTRACT:
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 (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, containing a precipitated zinc oxide precursor and a precipitated aluminum oxide precursor, to the two-phase, active zinc oxide containing component.
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Dictionary.com entries for “spheroidal” (2 pp., printed by examiner Aug. 30, 2004).
Dictionary.com entries for “spherical” (3 pp., printed by examiner Aug. 30, 2004).
Gangwal Santosh Kumar
Gupta Raghubir Prasad
Turk Brian Scott
Hertzog Ardith E.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Research Triangle Institute
Silverman Stanley S.
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