Metal impregnated activated carbons and method of making same
AssigneeCalgon Carbon Corporation
InventorAndrew James Warburton
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Abstract
An odor control product is disclosed comprising an activated carbon impregnated with a metal oxide and a salt, wherein the carbon has an activity high enough to compensate for the physical adsorption capacity used by the salt. Methods of making metal-impregnated activated carbon using water-soluble metal salts are provided without need for ammoniacal solvent media. An activated carbon base of higher activity than would be normally employed is impregnated with water-soluble metal salt. The impregnated carbon is impregnated with an aqueous alkaline solution and the resulting hydroxide decomposed to the metal oxide.
Claims20
A method for making metal-impregnated activated carbon for use in controlling or abating odor or other pollution, said method comprising the steps of:
- a. impregnating an activated carbon with a metal species, wherein said species is any water-soluble metal(II) compound capable of being precipitated with an aqueous alkaline solution and decomposing to give a corresponding metal oxide;
- b. impregnating said metal-impregnated carbon of step (a) with the aqueous alkaline solution, said reaction resulting with a metal(II) hydroxide species;
- and
- c. heating the resulting metal(II) hydroxide species at a temperature sufficient to decompose the hydroxide species within the pores of the impregnated carbon of step (b).
A method for making an odor removal product, comprising the steps of:
- a. dissolving metal salt in solution;
- b. impregnating an activated carbon with the metal salt;
- c. impregnating the metal-impregnated carbon with an aqueous alkaline solution;
- and
- d. drying the alkaline metal-impregnated carbon.
An odor removing product comprising an activated carbon impregnated with a metal oxide and salt, wherein the carbon has a carbon tetrachloride activity high enough to compensate for the physical adsorption capacity used by the salt.
Dependencies are inferred from the claim text.