Reversible sorbent for warm CO2 capture by pressure swing adsorption

• US 9,144,770 B2
• Filed: 09/19/2014
• Issued: 09/29/2015
• Est. Priority Date: 10/26/2012
• Status: Expired due to Fees

• Current Assignee: Massachusetts Institute of Technology
• Original Assignee: Massachusetts Institute of Technology
• Inventors: Liu, Zan, Green, William H.
• Primary Examiner(s): Godenschwager, Peter F
• Application Number:
  US14/491,015
• Publication Number:
  US 20150110696A1
• Time in Patent Office: 375 Days
• Field of Search: 252/192
• US Class Current: 1/1
• CPC Class Codes: B01D 2251/402 of magnesium
• CPC Class Codes: B01D 2253/1124 Metal oxides
• 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: B01D 53/047 Pressure swing adsorption
• CPC Class Codes: B01D 53/62 Carbon oxides
• CPC Class Codes: B01J 20/041 Oxides or hydroxides
• CPC Class Codes: B01J 20/20 comprising free carbon; comprising carbon obtained by carbonising processes
• CPC Class Codes: B01J 20/28057 Surface area, e.g. B.E.T specific surface area
• 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 20/3416 of sorbents or filter aids comprising free carbon, e.g. activated carbon
• CPC Class Codes: B01J 20/3491 by pressure treatment
• 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

Sorbent for reversible warm CO₂ capture. The sorbent includes activated carbon impregnated with magnesium oxide, wherein the magnesium oxide constitutes at least 5% by weight of the sorbent.

Claims

1. Method for capture of CO₂ by reversible pressure swing adsorption comprising contacting CO₂ in a temperature range of 200-300°

C. with a material selected from the group consisting of activated carbon, metal-organic frameworks, zeolites, activated alumina, and mesoporous silica impregnated with at least 5% by weight MgO.

2. The method of claim 1 wherein the MgO constitutes approximately 15% by weight of the material/MgO combination.