Metal oxide composite and a method of forming thereof

Patent metadata

Field	Value
Publication number	US-9370767-B2
Application number	US-201314361654-A
Country	US
Kind code	B2
Filing date	Feb 18, 2013
Priority date	Feb 16, 2012
Publication date	Jun 21, 2016
Grant date	Jun 21, 2016

Abstract

A method of forming a metal oxide composite, the method comprising mixing a metal oxide, at least two monomers and a dispersant to produce a slurry; gel casting the slurry to produce a green metal oxide composite; and sintering the green metal oxide composite to produce the metal oxide composite. A metal oxide composite formed according to the method. Use of the metal oxide composite, for catalyzing hydrolysis of metal borohydride to produce hydrogen.

First claim

The invention claimed is:

1. A method of forming a metal oxide composite in the form of beads, the method comprising:
mixing a metal oxide, at least two monomers and a dispersant to produce a slurry;
gel casting the slurry to produce a green metal oxide composite; wherein the gel casting comprises dropping the slurry into a gel casting media to form the green metal oxide composite as beads; and
sintering the green metal oxide composite to produce the metal oxide composite in the form of beads;
wherein the gel casting media comprises a graphite-oil media; and
wherein the metal oxide comprises at least one of: a cobalt-based metal oxide, a yttria stabilized zirconia-based metal oxide, a nickel-based metal oxide, and a perovskite-based metal oxide.

2. The method according to claim 1 , further comprising degassing the slurry prior to gel casting the slurry.

3. The method according to claim 1 , wherein the at least two monomers comprises an acrylamide (AM) and an N,N′-methylenebisacrylamide (MBAM).

4. The method according to claim 1 , further comprising adding at least one of a catalyst and an initiator to the slurry prior to the gel casting.

5. The method according to claim 4 , wherein the initiator is an ammonium persulphate solution.

6. The method according to claim 4 , wherein the catalyst is N,N,N′,N′-tetramethylethylenediamide (TEMED).

7. The method according to claim 1 , wherein the mixing further comprises adding a pore former in the mixing, the pore former configured to form pores in the metal oxide composite.

8. The method according to claim 7 , wherein the pore former comprises graphite powder.

9. The method according to claim 1 , wherein the mixing further comprises adding at least one sintering additive in the mixing.

10. The method according to claim 1 , wherein the sintering is carried out at a sintering temperature of between 1100° C. and 1300° C.

11. The method according to claim 1 , further comprising catalysing hydrolysis of metal borohydride to produce hydrogen gas using the metal oxide composite.

12. The method according to claim 11 , wherein the metal borohydride is sodium borohyride.

13. A metal oxide composite formed according to the method of claim 1 .

14. The metal oxide composite according to claim 13 , wherein the metal oxide composite is self-supported.

15. The metal oxide composite according to claim 13 , wherein the metal oxide has a weight percentage greater than 80 wt. %.

Assignees

• Univ Nanyang Tech

Inventors

• Zhang Lan
• Chan Siew Hwa
• He Hongquan

Classifications

• Y02E60/36

  Hydrogen production from non-carbon containing sources, e.g. by water electrolysis · CPC title

• B01J2235/15

  X-ray diffraction · CPC title

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title

• B01J35/733

  Perovskite-type · CPC title

• C04B2235/3275

  Cobalt oxides, cobaltates or cobaltites or oxide forming salts thereof, e.g. bismuth cobaltate, zinc cobaltite · CPC title