IP Library › Granted Patent US 12686622
Granted Patent B2
US 12686622 · App. 17/537,750 · Granted Jul 21, 2026

Calcium ruthenate composition of matter and calcium ruthenate catalysts

Inventors: Joseph Harold Montoya (Berkeley, CA); Muratahan Aykol (San Jose, CA)
Assignee: Toyota Research Institute, Inc.
C01G55/002H01M4/9033C01P2002/02C01P2002/50C01P2006/40C25B1/04C25B11/0773
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Quick Facts
Patent No.
US 12686622
App. No.
17/537,750
Filed
Nov 30, 2021
Granted
Jul 21, 2026
Kind
B2
Art Unit
1732
USPC
502/328
Abstract

A calcium ruthenate composition of matter includes a compound of calcium, ruthenium and oxygen with a chemical formula of Ca a Ru b O c and with ‘a’ greater than or equal to 2.75 and less than or equal to 3.25, ‘b’ greater than or equal to 0.75 and less than or equal to 1.25, and ‘c’ greater than or equal to 5.75 and less than or equal to 6.25. The Ca a Ru b O c is an oxygen evolution reaction catalyst, an oxygen reduction reaction catalyst, and/or a catalyst for the hydrolysis of a hydrogen containing compound.

Claims (44)

1 . A calcium ruthenate composition of matter comprising:

a compound of calcium, ruthenium and oxygen with a chemical formula consisting of Ca a Ru b O c , wherein:

a is greater than or equal to 2.5 and less than or equal to 3.5;

b is greater than or equal to 0.5 and less than or equal to 1.5; and

c is greater than or equal to 5.5 and less than or equal to 6.5.

2 . The calcium ruthenate composition of matter according to claim 1 , wherein:

a is greater than or equal to 2.75 and less than or equal to 3.25;

b is greater than or equal to 0.75 and less than or equal to 1.25; and

c is greater than or equal to 5.75 and less than or equal to 6.25.

3 . The calcium ruthenate composition of matter according to claim 1 , wherein:

a is greater than or equal to 2.8 and less than or equal to 3.2;

b is greater than or equal to 0.8 and less than or equal to 1.2; and

c is greater than or equal to 5.8 and less than or equal to 6.2.

4 . The calcium ruthenate composition of matter according to claim 1 , wherein:

a is about 3.0;

b is about 1.0; and

c is about 6.0.

5 . The calcium ruthenate composition of matter according to claim 1 , wherein the compound of calcium, ruthenium, and oxygen is an oxygen catalyst.

6 . The calcium ruthenate composition of matter according to claim 5 , wherein the compound of calcium, ruthenium, and oxygen is an oxygen evolution reaction catalyst.

7 . The calcium ruthenate composition of matter according to claim 5 , wherein the compound of calcium, ruthenium, and oxygen is an oxygen reduction reaction catalyst.

8 . The calcium ruthenate composition of matter according to claim 5 , wherein the compound of calcium, ruthenium, and oxygen is a catalyst for hydrolysis of a hydrogen containing compound.

9 . The calcium ruthenate composition of matter according to claim 5 further comprising a catalyst support, wherein the compound of calcium, ruthenium, and oxygen is bonded to a surface of the catalyst support.

10 . The calcium ruthenate composition of matter according to claim 9 , wherein the compound of calcium, ruthenium, and oxygen comprises particles of Ca a Ru b O c bonded to the surface of the catalyst support.

11 . The calcium ruthenate composition of matter according to claim 10 , wherein the particles of Ca a Ru b O c comprise at least one of microparticles of Ca a Ru b O c and nanoparticles of Ca a Ru b O c .

12 . The calcium ruthenate composition of matter according to claim 10 , wherein the particles of Ca a Ru b O c comprise amorphous Ca a Ru b O c .

13 . The calcium ruthenate composition of matter according to claim 9 , wherein the compound of calcium, ruthenium, and oxygen comprises a sputtered layer of Ca a Ru b O c .

14 . The calcium ruthenate composition of matter according to claim 13 , wherein the sputtered layer of Ca a Ru b O c comprises amorphous Ca a Ru b O c .

15 . A catalyst comprising:

an amorphous compound of calcium, ruthenium and oxygen with a chemical formula of Ca a Ru b O c , wherein:

a is greater than or equal to 2.5 and less than or equal to 3.5;

b is greater than or equal to 0.5 and less than or equal to 1.5; and

c is greater than or equal to 5.5 and less than or equal to 6.5.

16 . The catalyst according to claim 15 further comprising a catalyst support, wherein the amorphous compound of calcium, ruthenium and oxygen is bonded to a surface of the catalyst support.

17 . The catalyst according to claim 16 , wherein:

a is greater than or equal to 2.75 and less than or equal to 3.25;

b is greater than or equal to 0.75 and less than or equal to 1.25; and

c is greater than or equal to 5.75 and less than or equal to 6.25.

18 . The catalyst according to claim 17 , wherein the amorphous compound of calcium, ruthenium and oxygen bonded to the surface of the catalyst support is at least one of microparticles of Ca a Ru b O c , nanoparticles of Ca a Ru b O c , and a sputtered layer of Ca a Ru b O c .

19 . A catalyst comprising:

a catalyst support and nanoparticles of a compound of calcium, ruthenium and oxygen disposed on a surface of the catalyst support, wherein the nanoparticles are bonded to a surface of the catalyst support and have a chemical formula of Ca a Ru b O c with ‘a’ greater than or equal to 2.5 and less than or equal to 3.5, ‘b’ greater than or equal to 0.5 and less than or equal to 1.5, and ‘c’ greater than or equal to 5.5 and less than or equal to 6.5.

20 . The catalyst according to claim 19 , wherein:

a is greater than or equal to 2.85 and less than or equal to 3.15;

b is greater than or equal to 0.85 and less than or equal to 1.15; and

c is greater than or equal to 5.85 and less than or equal to 6.15.