Cyclic Tests in Batch Mode of CO2 Adsorption and Regeneration with Sorbent Consisting of Immobilized Amine on a Mesoporous Silica

A series of CO 2 adsorption tests were conducted in a fluidized bed vessel using an impregnated polyamine sorbent. This sorbent was cross-linked using a silyl derivative to improve its stability and hydrophobicity. The fluidization and adsorption behavior of this sorbent was characterized over a range of flows, temperatures, and CO 2 concentrations. A Latin hypercube space-filling experimental design was implemented for each of three operating modes (nonreactive at ambient and flue gas temperatures, and in a reactive mode using 10–20% CO 2 ) to evaluate hydrodynamics, thermal, and flue gas CO 2 adsorption effects independently. It was found that the variable having the greatest impact on adsorption capacity was the duration of testing. The capacity degraded by about 10% over the 100 h of testing. The slope from all points in the hypercube matrix indicates the heat of adsorption is approximately 65.8 kJ/mol CO 2, a value consistent with the literature.