Granted Patent B2

US 12,559,384 · App. 17/777,695 · Granted Feb 24, 2026

Inventor: Sang Hoon Song (Seoul, KR)

Assignee: Korea University Research and Business Foundation

C01G49/0018B01J47/02H01M10/0525

Abstract

Claims (10)

1 . A method of preparing an iron-chromium oxide, comprising:

providing an ion exchange column substituted with Fe 3+ ions;

adding a hexavalent chromium (Cr 6+ ) compound to the ion exchange resin column to obtain an ion-exchanged aqueous solution; and

heat-treating the ion-exchanged aqueous solution,

wherein the heat-treating is performed at 270° C. to 350° C.

2 . The method according to claim 1 , wherein, in the providing the ion exchange column substituted with Fe 3+ ions, the ion exchange column substituted with Fe 3+ ions is provided by adding an aqueous solution containing one or more selected from the group consisting of FeCl 3 , FeCl 3 ·6H 2 O, Fe(NO 3 ) 3 , and Fe(NO 3 ) 3 ·9H 2 O to an ion exchange resin.

3 . The method according to claim 2 , wherein the ion exchange resin is a cation exchange resin.

4 . The method according to claim 1 , wherein the hexavalent chromium (Cr 6+ ) compound is CaCrO 4 , Na 2 CrO 4 , or K 2 Cr 2 O 7 .

5 . The method according to claim 1 , wherein the ion-exchanged aqueous solution comprises Fe 3+ ions and Cr 6+ ions.

6 . The method according to claim 1 , wherein the heat-treating is performed under a vacuum atmosphere, an oxygen (O 2 ) atmosphere, a nitrogen (N 2 ) atmosphere, or an argon (Ar) atmosphere.

Assignments (1)

Priority Claims (2)

Continuity (1)

References Cited (24)