Catalyst for reforming tar-containing gas, method for preparing catalyst for reforming tar-containing gas, method for reforming tar-containing gas using catalyst for reforming tar containing gas, and method for regenerating catalyst for reforming tar-containing gas

Patent metadata

Field	Value
Publication number	US-9393551-B2
Application number	US-201013320524-A
Country	US
Kind code	B2
Filing date	May 18, 2010
Priority date	May 19, 2009
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

Abstract

Disclosed is a catalyst for reforming a tar-containing gas, wherein the catalyst contains at least one composite oxide as oxide containing nickel, magnesium, cerium and aluminum and the content of alumina as a single compound is limited to 5% by mass or less.

First claim

The invention claimed is:

1. A catalyst for reforming a tar-containing gas, wherein:
the catalyst comprises at least one composite oxide as oxide containing nickel, magnesium, cerium and aluminum;
a content of alumina as a single compound in the catalyst is limited to 5% by mass or less; and
a content of magnesium in the catalyst is 3 to 45% by mass.

2. The catalyst according to claim 1 , wherein a crystal structure of the composite oxide includes a NiMgO crystal phase, MgAl 2 O 4 crystal phase, and CeO 2 crystal phase.

3. The catalyst according to claim 2 , wherein, of the respective crystal phases, a size of crystallites of the (200) plane of the NiMgO crystal phase is 1 nm to 50 nm, a size of crystallites of the (311) plane of the MgAl 2 O 4 crystal phase is 1 nm to 50 nm, and a size of crystallites of the (111) plane of the CeO 2 crystal phase is 1 nm to 50 nm, in which the size of crystallites is obtained by X-ray diffraction measurement.

4. The catalyst according to claim 1 , wherein:
a content of nickel in the catalyst is 1 to 50% by mass, a content of cerium is 1 to 40% by mass, and a content of aluminum converted to alumina is 20 to 80% by mass.

5. A method for preparing a catalyst for reforming a tar-containing gas according to claim 1 , the catalyst comprising at least one composite oxide containing nickel, cerium, magnesium and aluminum and wherein the catalyst further comprises alumina as a single compound limited to 5% by mass or less and a content of magnesium of from 3% to 45% by mass with the method comprising:
coprecipitating a precipitate from a mixed solution containing a nickel compound, a magnesium compound and a cerium compound;
burning the precipitate;
adding an alumina powder and water, or an alumina sol to the burned precipitate to produce a mixture; and
baking the mixture.

6. The method according to claim 5 , wherein the baking includes drying and grinding the mixture, or drying, burning, grinding and molding the mixture, before baking the mixture.

7. A method for preparing a catalyst for reforming a tar-containing gas according to claim 1 , the catalyst comprising at least one composite oxide containing nickel, cerium, magnesium and aluminum and wherein the catalyst further comprises alumina as a single compound limited to 5% by mass or less and a content of magnesium of from 3% to 45% by mass with the method comprising:
coprecipitating a precipitate from a mixed solution containing a nickel compound, a magnesium compound and a cerium compound;
adding an alumina powder and water, or an alumina sol to the precipitate to produce a mixture; and
baking the mixture.

8. The method according to claim 7 , wherein the baking includes drying and grinding the mixture, or drying, burning, grinding and molding the mixture, before baking the mixture.

9. A method for preparing a catalyst for reforming a tar-containing gas according to claim 1 , the catalyst comprising at least one composite oxide containing nickel, cerium, magnesium and aluminum and wherein the catalyst further comprises alumina as a single compound limited to 5% by mass or less and a content of magnesium of from 3% to 45% by mass with the method comprising:
coprecipitating a precipitate from a mixed solution containing a nickel compound, a magnesium compound and a cerium compound;
adding an alumina powder and water, or an alumina sol to the precipitate to produce an intermediate mixture;
burning the intermediate mixture;
adding an alumina powder and water, or an alumina sol to the intermediate mixture to produce a mixture; and
baking the mixture.

10. The method according to claim 9 , wherein the baking includes drying and grinding the mixture, or drying, burning, grinding and molding the mixture, before baking the mixture.

11. A method for preparing a catalyst for reforming a tar-containing gas according to claim 1 , the catalyst comprising at least one composite oxide containing nickel, cerium, magnesium and aluminum and wherein the catalyst further comprises alumina as a single compound limited to 5% by mass or less and a content of magnesium of from 3% to 45% by mass with the method comprising:
coprecipitating a mixture from a mixed solution containing a nickel compound, a magnesium compound, a cerium compound and an aluminum compound; and
baking the mixture.

12. The method according to claim 11 , wherein the baking includes drying and grinding the mixture, or drying, burning, grinding and molding the mixture, before baking the mixture.

13. A method for reforming a tar-containing gas using the catalyst for reforming a tar-containing gas prepared by the method according to claim 5 , comprising:
bringing hydrogen, carbon dioxide and water vapor in a tar-containing gas generated when a carbonaceous material is thermally decomposed, in contact with the catalyst for reforming a tar-containing gas.

14. The method according to claim 13 , wherein the method comprises:
collecting by condensation of tar in the tar-containing gas generated when a carbonaceous material is thermally decomposed;
gasifying the tar by heating; and
bringing at least one of hydrogen, carbon dioxide and water vapor incorporated from the outside in contact with the catalyst for reforming a tar-containing gas.

15. The method according to claim 13 , wherein, in the being brought contact with the catalyst for reforming a tar-containing gas, an oxygen-containing gas incorporated from the outside is further brought in contact with the catalyst.

16. The method according to claim 13 , wherein the tar-containing gas contains 20 ppm to 4,000 ppm of hydrogen sulfide.

17. The method according to claim 13 , wherein the tar-containing gas is a carbonized gas generated when coal is carbonized.

18. The method according to claim 13 , wherein the tar-containing gas is a coke oven gas discharged from a coke oven.

19. The method according to claim 13 , wherein the tar-containing gas is a carbonized gas generated when biomass is carbonized.

20. The method according to claim 13 , wherein the catalyst for reforming a tar-containing gas is brought in contact with the tar-containing gas under an atmosphere at 600 to 1,000° C.

21. A method for regenerating a catalyst for reforming a tar-containing gas by bringing the catalyst in contact with one of water vapor and air, in a case where performance of the catalyst is deteriorated by at least one of carbon deposition and sulfur poisoning when performing the method for reforming the tar-containing gas according to claim 13 .

22. A method for reforming a tar-containing gas using the catalyst for reforming a tar-containing gas prepared by the method according to claim 6 , comprising:
bringing hydrogen, carbon dioxide and water vapor in a tar-containing gas generated when a carbonaceous material is thermally decomposed, in contact with the catalyst for reforming a tar-containing gas.

23. A method for reforming a tar-containing gas using the catalyst for reforming a tar-containing gas prepared by the method according to claim 7 , comprising:
bringing hydrogen, carbon dioxide and water vapor in a tar-containing gas generated when a carbonaceous material is thermally decomposed, in contact with the catalyst for reforming a tar-containing gas.

24. A method for reforming a tar-containing gas using the catalyst for reforming a tar-containing gas prepared by the method according to claim 8 , comprising:
bringing hydrogen, carbon dioxide and

Assignees

• Suzuki Kimihito
• Fujimoto Kenichiro
• Nippon Steel & Sumitomo Metal Corp

Inventors

• Suzuki Kimihito
• Fujimoto Kenichiro

Classifications

• C01B2203/1082

  Composition of support materials · CPC title

• C10J3/005

  Rotary drum or kiln gasifiers · CPC title

• C01B3/40

  characterised by the catalyst · CPC title

• B01J23/002

  Mixed oxides other than spinels, e.g. perovskite · CPC title

• C01B2203/1094

  Promotors or activators · CPC title