Attrition resistant, zinc titanate-containing, reduced sorbents and methods of use thereof
AssigneesResearch Triangel Institute, Intercat, Inc.
InventorsAlbert A. Vierheilig, Raghubir P. Gupta, Brian S. Turk
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Abstract
Reduced sulfur gas species (e.g., H2S, COS and CS2) are removed from a gas stream by compositions wherein a zinc titanate ingredient is associated with a metal oxide-aluminate phase material in the same particle species. Nonlimiting examples of metal oxides comprising the compositions include magnesium oxide, zinc oxide, calcium oxide, nickel oxide, etc.
Claims28
A process for removing a reduced sulfur gas from a process stream, said process comprising contacting the process stream with a reduced sulfur gas sorbing composition comprising, in the same particle, zinc titanate and a metal oxide-aluminate phase in order to remove at least a portion of the reduced sulfur gas from the process stream.
2 The process according to claim 1, wherein the metal oxide-aluminate phase of the sulfur sorbing composition has the general formula MO, wherein M is a metal selected from the group consisting of magnesium, zinc, nickel and calcium, and O is oxygen.
A process for removing a reduced sulfur species from a process stream, comprising:
- (a) providing an attrition-resistant particulate sorbent comprising a plurality of substantially uniform particles comprising a zinc titanate phase and a zinc oxide-aluminate phase, said zinc titanate phase being present in an amount of from about 5 w. % to about 80 w. % of said particles, said zinc oxide-aluminate phase being present in an amount of from about 20 w. % to about 95 w. % of said particles, said zinc titanate and zinc oxide-aluminate phases constituting at least about 80 w. % of said particles, and said particles being substantially free of unreacted alumina;
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- (b) contacting the process stream with said particulate sorbent under conditions sufficient to cause sorption of sulfur by said particulate sorbent.
A method of stabilizing an unreacted alumina support so as to be chemically nonreactive with zinc atoms from a zinc-containing compound comprising a reduced sulfur sorbent composition, said method comprising:
- chemically reacting a metal oxide with alumina to form a metal oxide-aluminate phase material under elevated temperature conditions, said metal oxide-aluminate phase-forming chemical reaction reducing or eliminating deactivation of the zinc-containing compound comprising the reduced sulfur sorbent composition at the elevated temperature.
Dependencies are inferred from the claim text.