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

A series of CO2 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 CO2 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% CO2) to evaluate hydrodynamics, thermal, and flue gas CO2 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 CO2, a value consistent with the literature.