Method for producing sorbents for CO;capture under high temperatures

• US 9,114,359 B2
• Filed: 11/11/2009
• Issued: 08/25/2015
• Est. Priority Date: 11/11/2008
• Status: Expired due to Fees

• Current Assignee: The University of Queensland
• Original Assignee: The University of Queensland
• Inventors: Feng, Bo, Liu, Wenqiang
• Primary Examiner(s): Godenschwager, Peter F
• Application Number:
  US13/128,696
• Publication Number:
  US 20120025134A1
• Time in Patent Office: 2,113 Days
• Field of Search: 252/184, 423/230
• US Class Current: 1/1
• CPC Class Codes: B01D 2251/402 of magnesium
• CPC Class Codes: B01D 2251/404 of calcium
• CPC Class Codes: B01D 2251/60 Inorganic bases or salts
• CPC Class Codes: B01D 2253/306 Surface area, e.g. BET-specific surface
• CPC Class Codes: B01D 2257/30 Sulfur compounds
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 53/62 Carbon oxides
• CPC Class Codes: B01D 53/81 Solid phase processes
• CPC Class Codes: B01J 20/041 Oxides or hydroxides
• CPC Class Codes: B01J 20/06 comprising oxides or hydroxides of metals not provided for in group B01J20/04
• CPC Class Codes: B01J 20/28059 being less than 100 m2/g
• CPC Class Codes: B01J 20/3078 Thermal treatment, e.g. calcining or pyrolizing
• CPC Class Codes: B01J 20/3204 Inorganic carriers, supports or substrates
• CPC Class Codes: B01J 20/3236 containing metal, other than zeolites, e.g. oxides, hydroxides, sulphides or salts
• CPC Class Codes: B01J 20/3433 of sorbents or filter aids other than those covered by B01J20/3408 - B01J20/3425
• CPC Class Codes: B01J 20/3483 by thermal treatment not covered by groups B01J20/3441 - B01J20/3475, e.g. by heating or cooling
• CPC Class Codes: C01B 13/185 Preparing mixtures of oxides
• CPC Class Codes: C01F 11/04 by thermal decomposition
• CPC Class Codes: C01F 11/06 of carbonates
• CPC Class Codes: C01F 7/164 Calcium aluminates
• CPC Class Codes: C01P 2002/72 : by d-values or two theta-values, e.g. as X-ray diagram
• CPC Class Codes: C01P 2002/85 : by XPS, EDX or EDAX data
• CPC Class Codes: C01P 2004/03 : obtained by SEM
• CPC Class Codes: C01P 2006/12 : Surface area
• CPC Class Codes: C01P 2006/14 : Pore volume
• CPC Class Codes: C01P 2006/16 : Pore diameter
• CPC Class Codes: Y02C 20/40 : of CO2
• CPC Class Codes: Y02P 20/151 : Reduction of greenhouse gas [GHG] emissions, e.g. CO2

Abstract

A method of producing a CO₂ adsorbent and CO₂ adsorbents. The method including the steps of: (a) producing a mixture of at least one calcium salt and at least one metal support cation in at least one solvent; (b) drying the mixture to produce a solid containing a calcium metal salt; and (c) calcining the dried solid to produce a sorbent of calcium oxide dispersed in a porous metal support.

Claims

1. A method of producing a CO₂ adsorbent, including the steps of:

(a) producing a mixture of at least one calcium salt and at least one metal support cation which is not calcium in at least one solvent, wherein the calcium salt is completely soluble in the at least one solvent, and wherein the mixture is produced by

(i) adding an organic calcium salt and at least one organic metallic salt to the at least one solvent;

or

(ii) adding a compound or mineral to the at least one solvent, the compound or mineral comprising both a calcium oxide to provide calcium ions for the at least one calcium salt, and one or more metal oxides to provide at least one metal ion selected from the group consisting of magnesium, aluminum, silicon, titanium, lanthanum, cerium, zirconium and hafnium;

(b) solidifying the mixture by evaporating the solvent from the mixture to produce a solid containing a calcium metal salt; and

(c) calcining the dried solid to produce a sorbent of calcium oxide particles separated by grains of a porous metal oxide support, the calcium oxide particles having a size of about 36 nm to about 150 nm in diameter.

2. The method of producing the CO₂ adsorbent of claim 1, wherein the metal organic salt is selected from the group consisting of metal acetate, metal benzoate, metal propionate, metal citrate, metal lactate, metal gluconate, metal formate and metal stearate, and the solvent is selected from the group consisting of water, mineral acid, organic acid and low molecular weight alcohol.

3. The method of producing the CO₂ adsorbent of claim 1, wherein the one or more metal oxides are selected from the group consisting of magnesium oxide, aluminium oxide, silicon oxide, titanium oxide, lanthanum trioxide, cerium oxide, zirconium oxide, and hafnium oxide, and compounds or minerals containing any of these oxides.

4. The method of producing the CO₂ adsorbent of claim 3 wherein the metal oxide is magnesium oxide.

5. The method of producing the CO₂ adsorbent of claim 1, wherein the solvent is an organic acid selected from the group consisting of acetic acid, benzoic acid, propionic acid, citric acid, lactic acid, gluconic acid, formic acid and stearic acid.

6. The method of producing the CO₂ adsorbent of claim 1, wherein the compound or mineral is dolomite.

7. The method of producing the CO₂ adsorbent of claim 1 wherein the at least one calcium salt and the at least one metal support cation is added in an amount which results in a calcium oxide content of greater than 0 wt % to about 95 wt % in the final adsorbent.

8. The method of claim 7 wherein the at least one calcium salt and the at least one metal support cation is added in an amount which results in a calcium oxide content of about 10 wt % to about 83 wt % in the final adsorbent.

9. The method of claim 7 wherein the at least one calcium salt and the at least one metal support cation is added in an amount which results in a calcium oxide content of greater than about 67 wt % to about 83 wt % in the final adsorbent.

10. The method of claim 7 wherein the mixture includes calcium oxide and one or more metal oxides.

11. The method of producing the CO₂ adsorbent of claim 10 wherein the one or more metal oxides is selected from the group consisting of magnesium oxide, aluminium oxide, silicon oxide, titanium oxide, lanthanum trioxide, cerium oxide, zirconium oxide, and hafnium oxide, and compounds or minerals containing any of these oxides.

12. The method of producing the CO₂ adsorbent of claim 11 wherein the metal oxide is magnesium oxide.

13. The method of claim 1, wherein the grains of the porous metal support that separate the calcium oxide particles are about 9 nm to about 50 nm in diameter.

14. A method of producing a CO₂ adsorbent, including the steps of:

(a) producing a mixture of at least one calcium salt and at least one metal support cation in at least one solvent, wherein the calcium salt is completely soluble in the at least one solvent, and wherein the mixture is produced by adding a compound or mineral to the at least one solvent, the compound or mineral comprising both calcium oxide and at least one metal oxide which forms the at least one metal support cation in the solvent, wherein the at least one metal support cation is selected from the group consisting of magnesium, aluminum, silicon, titanium, lanthanum, cerium, zirconium, and hafnium;

(b) solidifying the mixture by evaporating the solvent from the mixture to produce a solid containing a calcium metal salt; and

(c) calcining the dried solid to produce a sorbent of calcium oxide particles separated by grains of a porous metal oxide support, the calcium oxide particles having a size of about 36 nm to about 150 nm in diameter.