Stabilized inorganic oxide supports and adsorbents derived therefrom for carbon dioxide capture

A method for preparing an adsorbent for capturing carbon dioxide from gases, said method comprising the following steps:

• a. stabilizing at least one alumina-containing precursor selected from the group consisting of gamma-alumina, silica-alumina, boebmite, pseudoboehmite and gibbsite by thermally treating said alumina-containing precursor to obtain a stabilized alumina-containing support, wherein the thermal treatment is carried out using at least one technique selected from the group consisting of calcination and steaming;
• b. impregnating at least one alkali or alkaline earth compound into the stabilized alumina-containing support to obtain an alkali or alkaline earth compound-impregnated stabilized alumina-containing support, wherein the alkali or alkaline earth compound is at least one compound selected from the group consisting of alkali or alkaline earth carbonates, alkali or alkaline earth bicarbonates and alkali or alkaline earth oxides;
• and
• c. drying the alkali or alkaline earth compound-impregnated stabilized alumina-containing support, wherein the step of drying is carried out at a temperature in the range of 80° C. to 140° C., preferably at 120° C., to obtain the adsorbent;
• wherein the amount of alkali or alkaline earth compound impregnated in the stabilized alumina-containing support ranges from 5 wt % to 60 wt % of the total weight of the adsorbent.