Sorption of carbon dioxide from wet gases by K2CO3-in-porous matrix: Influence of the matrix nature

In a fixed-bed absorber at 40 degreesC, the dynamics of carbon dioxide sorp tion over composite sorbents prepared by impregnation of potassium carbonat e in various porous matrixes is studied. The dynamic capacity of the synthe sized sorbents is shown to reach 0.12 g CO2 per 1 g of the sorbent. The com posite dynamic capacity depends on the nature of the host matrix and decrea ses in the sequence alumina > activated carbon > vermiculite > silica gel. For K2CO3-on-alumina, the sorption capacity decreases considerably after th e first cycle of "absorption and regeneration under 200-350 degreesC", wher eas the sorbents based on active carbons could be reversibly restored. The findings are discussed within the idea on a chemical interaction between th e host matrix and the impregnated salt.