Point source carbon capture systems

A method for removal of CO2 from an exhaust gas stream comprising:

• flowing an exhaust gas stream produced by a point source through at least one adsorber bed formed of monolithic structural adsorbers, the monolithic structural adsorbers comprising an outer peripheral wall and a plurality of inner partition walls supporting an organic compound or inorganic compound adsorbing CO2 from the exhaust gas stream, wherein the exhaust gas stream has an inlet temperature of at least 60° C., a CO2 content of 3-20 percent, and a water vapor content of 2-22 percent;
• isolating the adsorber bed from the exhaust gas stream;
• flowing steam having a pressure of −2 psig to 2 psig and a maximum temperature of 120° C. through the monolithic structural adsorbers in a direction opposite of the exhaust gas stream flow to desorb the CO2 captured by the adsorber bed by providing enthalpy for CO2 desorption;
• condensing a first portion of the steam in pores of the monolithic structural adsorbers;
• sweeping the desorbed CO2 from the adsorber bed with a second portion of the steam to provide a mixture of the desorbed CO2 and sweeping steam;
• separating the desorbed CO2 from the mixture thereby providing a product gas with at least 90 percent CO2 by weight;
• and
• discontinuing isolation of the adsorber bed from the exhaust gas stream, wherein the exhaust gas stream re-enters the monolithic structural adsorbers to evaporate at least some of the first portion of steam condensed in the pores and cool the adsorbers to a temperature less than 90° C. to begin a new adsorption cycle.