Katsunori Yogo

Pure silica CHA type zeolite for CO2 separation using pressure swing adsorption at high pressure

Pure silica CHA type zeolite (Si-CHA) was used in a high pressure swing adsorption for CO2 separation in the presence of water. The effective CO2 adsorption capacity was much higher than that of zeolite 13X, and was not influenced by coexisting water. The breakthrough curve gave an effective CO2 adsorption capacity of 3.1 mol kg−1 and CO2–N2 selectivity of >31.

Mesoporous Silica Sorbents Impregnated with Blends of Tetraethylenepentamine and Alkanolamine for CO2 Separation

Mesocellular silica foam (MSU-F) supports were functionalized via wet impregnation with various amine and alcohol compounds for use as high-capacity adsorbents for CO2 separation. The effect of the amino, hydroxyl, and ether functional groups in the impregnating mixture on the CO2 adsorption capacity was investigated. Chemical adsorption was controlled by the composition of the compounds, and the blending effect on the adsorption performance was dependent on the temperature. MSU-F (30 wt.%) impregnated with a mixture of tetraethylenepentamine (40 wt.%) and aminoethylethanolamine (30 wt.%) showed a high adsorption capacity of 5.4 mmol/g at 333 K for 15 kPa CO2.