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Partic. vol. 46 pp. 67-74 (October 2019)
doi: 10.1016/j.partic.2018.08.004

CO2 adsorption in a confined fluidized bed of zeolite pellets: Influence of operating velocity

Rossella Girimonte*, Brunello Formisani, Flaviano Testa

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rossella.girimonte@unical.it

Highlights

    • Adsorption of CO2 on a confined fluidized bed of pelletized 13X zeolite is studied. • A comparison is made with the results obtained from a conventional fluidized bed. • Confined fluidization positively affects the efficiency of the adsorption process. • The increase of breakthrough time and CO2 uptake is remarkable. • The temperature increase associated with CO2 adsorption is more easily controlled.

Abstract

CO2 adsorption is performed across a fluidized bed comprising a commercial pelletized 13X zeolite confined to the interstitial void network of a coarse glass sphere packed bed. Compared with traditional fixed bed adsorption, the packed fluidized system allows operation across a wide-range of gas velocities without a substantial increase in pressure drop. Additionally, with respect to conventional fluidization regimes, the technique adopted herein prevents the formation of bubbles in favour of enhancing the bed expansion ability. Furthermore, for a given mass of sorbent, the CO2 uptake capacity is observed to increase as a result of improved thermal conditions and in eliminating any by-pass effect at the gas–particle interface, which is associated to the suppression of bubbling.

Graphical abstract

Keywords

CO2 capture; Adsorption; Zeolite 13X; Confined fluidized beds; Packed fluidized bed