High capacity carbon dioxide sorbent

• US 9,120,079 B1
• Filed: 03/17/2014
• Issued: 09/01/2015
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Tda Research, Inc.
• Original Assignee: Tda Research, Inc.
• Inventors: Alptekin, Gokhan, Dietz, Steven Dean, Jayaraman, Ambalavanan
• Primary Examiner(s): Rump, Richard M
• Application Number:
  US14/217,218
• Time in Patent Office: 533 Days
• Field of Search: 502/416
• US Class Current: 1/1
• CPC Class Codes: B01D 2253/102 Carbon
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 53/02 by adsorption, e.g. preparative gas chromatography solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01
• CPC Class Codes: B01J 20/20 comprising free carbon; comprising carbon obtained by carbonising processes
• CPC Class Codes: B01J 20/22 comprising organic material
• CPC Class Codes: Y02C 20/40 of CO2

Abstract

The present invention provides a sorbent for the removal of carbon dioxide from gas streams, comprising: a CO₂ capacity of at least 9 weight percent when measured at 22° C. and 1 atmosphere; an H₂O capacity of at most 15 weight percent when measured at 25° C. and 1 atmosphere; and an isosteric heat of adsorption of from 5 to 8.5 kilocalories per mole of CO₂. The invention also provides a carbon sorbent in a powder, a granular or a pellet form for the removal of carbon dioxide from gas streams, comprising: a carbon content of at least 90 weight percent; a nitrogen content of at least 1 weight percent; an oxygen content of at most 3 weight percent; a BET surface area from 50 to 2600 m²/g; and a DFT micropore volume from 0.04 to 0.8 cc/g.

Claims

1. A carbon sorbent for the removal of carbon dioxide from gas streams, comprising:

(a) a CO₂ capacity of at least 9 weight percent when measured at 22°

C. and 1 atmosphere;

(b) an H₂O capacity of at most 1 weight percent when measured at 25°

C. and 1 atmosphere;

(c) an isosteric heat of adsorption of from 6 to 8.5 kilocalories per mole of CO₂; and

,

(d) a nitrogen content of at least 2.2 wt %, which is present in the form of pyridine, pyridone or pyrrole.

2. The carbon sorbent of claim 1, wherein the isosteric heat of adsorption is from 6.0 to 7.7 kilocalories per mole of CO₂.

3. The carbon sorbent of claim 1 further comprising:

a CO₂ capacity of at least 7 weight percent when measured at 60°

C. and 1 atmosphere.

4. The carbon sorbent of claim 1 further comprising:

a CO₂ capacity of at least 4.8 weight percent when measured at 22°

C. and 0.15 atmosphere.

5. The carbon sorbent of claim 1 further comprising:

a CO₂ capacity of at least 2.3 weight percent when measured at 60°

C. and 0.15 atmosphere.

6. A carbon sorbent in a powder, a granular or a pellet form for the removal of carbon dioxide from gas streams, comprising:

(a) a carbon content of at least 90 weight percent;

(b) a nitrogen content of at least 2.2 weight percent, which is present in the form of pyridine, pyridone or pyrrole;

(c) an oxygen content of at most 1.8 weight percent;

(d) a BET surface area from 50 to 2600 m²/g; and

,

(e) a DFT micropore volume from 0.04 to 0.8 cc/g.

7. The carbon sorbent of claim 6, further comprising:

an H₂O capacity of at most 1 weight percent, based on the mass of the sorbent when measured at 25°

C. and 1 atmosphere.

8. The carbon sorbent of claim 6, further comprising:

an isosteric heat of adsorption of from 6.0 to 8.5 kilocalories per mole of CO₂.

9. The carbon sorbent of claim 8, wherein the isosteric heat of adsorption is from 6.0 to 7.7 kilocalories per mole of CO₂.

10. The carbon sorbent of claim 6, further comprising:

a carbon dioxide capacity of at least 9 weight percent when measured at 1.0 atmosphere and 22°

C.

11. The carbon sorbent of claim 6, further comprising:

a carbon dioxide capacity of at least 4.8 weight percent when measured at 0.15 atmosphere and 22°

C.

12. The carbon sorbent of claim 6, further comprising:

a carbon dioxide capacity of at least 7 weight percent when measured at 1.0 atmosphere and 60°

C.

13. The carbon sorbent of claim 6, further comprising:

a carbon dioxide capacity of at least 2.3 weight percent when measured at 0.15 atmosphere and 60°

C.

14. The carbon sorbent of claim 6, further comprising:

a pH of at least 9.0.

15. The carbon sorbent of claim 14, further comprising:

a pH of at least 11.0.