CaO Based Carbon Dioxide Absorbent and Method of Making

• US 20100311577A1
• Filed: 06/05/2009
• Published: 12/09/2010
• Est. Priority Date: 06/05/2009
• Status: Abandoned Application

• Current Assignee: Battelle Memorial Institute
• Original Assignee: Battelle Memorial Institute
• Inventors: Zhu, Kake, Nie, Zimin, Li, Liyu, Howard, Christopher J., King, David L., Liu, Jun
• Application Number:
  US12/479,320
• Publication Number:
  US 20100311577A1
• Time in Patent Office: Days
• US Class Current: 502/400
• CPC Class Codes: B01D 2251/402 of magnesium
• CPC Class Codes: B01D 2251/404 of calcium
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 53/62 Carbon oxides
• 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 20/08 comprising aluminium oxide or hydroxide; comprising bauxite
• CPC Class Codes: B01J 20/103 comprising silica
• CPC Class Codes: B01J 20/30 Processes for preparing, regenerating, or reactivating
• CPC Class Codes: B01J 20/3078 Thermal treatment, e.g. calcining or pyrolizing
• 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: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
• CPC Class Codes: Y02C 20/40 of CO2

Abstract

A method for making a class of relatively stable porous carbon dioxide absorbents by mixing inert nanoparticles with a CaO precursor followed by high temperature calcination. In the preferred embodiments of this invention this process takes place in the essential absence of nitrates. In some embodiments of the invention the method further includes forming the inert nanoparticles-doped porous CaO material by decomposing a mixture of inert particles and CaO precursor material.

Claims

1. A method for making a CO₂ absorbent having a stable porous structure said method characterized by:

physically dry mixing Ca(CH₃COO)₂ with inert nanoparticles having a size less than 10 nms in an essentially nitrate free environment to form a nitrate free mixture and calcining this mixture to form a stable porous microstructure having CO₂ absorbent properties.

3. The method of claim 1 wherein said inert nanoparticles comprise MgO.

4. The method of claim 1 further comprising the step of forming said porous CaO material after mixing by decomposition.

5. The method of claim 4 wherein said decomposition is thermal decomposition.

9. The method of claim 1 wherein said inert material is selected from the group consisting of Al₂O₃, SiO₂, TiO₂, ZrO₂, and lanthanide oxides.

14. The method of claim 1 further comprising the step of thermally decomposing a mixture of inert particles and CaO precursor material.

2. (canceled)

6. (canceled)

7. The method of claim 6 wherein said inert nanoparticles comprise MgO.

8. The method of claim 7 wherein said nanoparticles have a mean size smaller than 20 nms.

10. (canceled)

11. A method for making a CO₂ absorbent, said mixture comprising the steps of:

physically dry mixing Ca(CH₃COO)₂ with inert MgO nanoparticles having a size less than 10 nms in an essentially nitrate free environment to form a mixture; and

calcining said mixture.

12. The method of claim 11 wherein said nanoparticles having a particle size less than 20 nanometers.

13. A CO₂ adsorbent having a porous structural feature resulting from creation by a process wherein an essentially nitrate free Ca-containing material is dry physically_mixed with a preselected nitrate free nanoparticle having a size less than 10 nms to form a mixture that then is calcined to form the porous structural feature.