Assessment of fine sorbents performances for CO2 capture in a sound assisted fluidized bed

The aim of the present work is to compare the adsorption performances of different materials (two activated carbons, four zeolites and a metal organic framework) under sound-assisted fluidization conditions (140 dB-80 Hz) in order to maximize the gas-solid contact efficiency and, in turn, minimize the limitations to the intrinsic adsorption capacity of the sorbents. All the tests were performed at ambient temperature and pressure with values of CO2 concentration typical of flue gases (5-10 vol.%). The different behaviors exhibited by the materials were explained on the basis of their textural properties. In particular, the microporosity falling in the range of 8.3-12 Å strongly affects the CO2 adsorption performances under the investigated operating conditions.