Metal oxide functionalized nano porous carbon-derived sorbents for low-concentration co2 capture applications

Abstract

A sorbent is made by pyrolyzing a carbon source (preferably coal) at a temperature of at least 500° C. to form pyrolyzed porous carbon that is reacted with acid to form carboxylic acid (—COOH) moieties and adding a metal ion to bind the metal at the carboxylate sites in the pyrolyzed porous carbon. A sorbent is described that comprises a pyrolyzed porous carbon support; magnesium and carboxylate moieties disposed in the pyrolyzed porous carbon support; and possessing a CO2 adsorption isotherm between 0.0 and 0.05 bar CO2 having a slope that is at least 20% greater than between 0.40 and 0.45. CO2 can be selectively removed via pressure and/or temperature swing desorption by contacting a CO2-comprising fluid with the sorbent.

Dependencies are inferred from the claim text.