Carbon dioxide adsorbents, production methods therof, and methods for separating carbondioxide using the same

Patent metadata

Field	Value
Publication number	US-9839900-B2
Application number	US-201414563212-A
Country	US
Kind code	B2
Filing date	Dec 8, 2014
Priority date	Dec 31, 2013
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

A carbon dioxide adsorbent includes a porous metal oxide represented by Chemical Formula 1, the porous metal oxide having a specific surface area of greater than or equal to about 30 m 2 /g, and an average pore size of greater than or equal to about 2 nm.

First claim

What is claimed is:

1. A carbon dioxide adsorbent comprising a porous metal oxide represented by Chemical Formula 1,
the porous metal oxide having a specific surface area of greater than or equal to about 40 m 2 /g, an average pore size of greater than or equal to about 10 nm, and has a pore volume of greater than or equal to about 0.17 cm 3 /g:
MeO  [Chemical Formula 1]

wherein Me is one of Ca, Sr, and Ba.

2. The carbon dioxide adsorbent of claim 1 , wherein the porous metal oxide has an average pore size of less than or equal to about 300 nm.

3. The carbon dioxide adsorbent of claim 1 , wherein the porous metal oxide has simple cubic pores.

4. The carbon dioxide adsorbent of claim 1 , wherein the porous metal oxide has spherical pores.

5. The carbon dioxide adsorbent of claim 1 , wherein the porous metal oxide is configured to capture carbon dioxide at a temperature ranging from about 200° C. to about 550° C.

6. A process comprising:
dissolving a metal salt in water to obtain an aqueous solution, the metal salt including one of Ca, Sr, and Ba;
adding an alkaline compound to the aqueous solution to obtain a precipitate;
drying the precipitate; and
calcining the dried precipitate to obtain the carbon dioxide adsorbent of claim 1 .

7. The process for preparing a carbon dioxide adsorbent of claim 6 , wherein the adding adds the alkaline compound to the aqueous solution at a temperature of greater than or equal to about 25° C.

8. The process for preparing a carbon dioxide adsorbent of claim 6 , wherein the drying freezes the precipitate at a temperature of less than or equal to about 0° C. and removes water from the frozen precipitate under a reduced pressure.

9. The process for preparing a carbon dioxide adsorbent of claim 6 , wherein the drying includes using a supercritical fluid.

10. The process for preparing a carbon dioxide adsorbent of claim 9 , wherein the supercritical fluid is supercritical carbon dioxide.

11. The process for preparing a carbon dioxide adsorbent of claim 6 , wherein the calcining calcines the dried precipitate at a temperature of greater than or equal to about 400° C.

12. A method of separating carbon dioxide, the method comprising contacting the carbon dioxide adsorbent of claim 1 with a gas mixture containing carbon dioxide.

13. The method of claim 12 , wherein the contacting contacts the carbon dioxide adsorbent with the gas mixture further including at least one gas selected from hydrogen, nitrogen, and methane.

14. The method of claim 12 , further comprising:
heat-treating the carbon dioxide adsorbent at a temperature of greater than or equal to about 50° C. under a reduced pressure to desorb carbon dioxide adsorbed to the carbon dioxide adsorbent.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kwon Soon Chul
• Kwon Hyuk Jae
• Lee Hyun Chul
• Lee Jun Ho

Classifications

• C01F11/06

  of carbonates · CPC title

• B01D2253/306

  Surface area, e.g. BET-specific surface · CPC title

• C01F11/188

  Barium carbonate · CPC title

• B01D2257/504

  Carbon dioxide · CPC title

• Y02P20/152

  Cross-Sectional Technologies · mapped topic