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Advisor(s)
Abstract(s)
The applicability of 3D-printed activated carbons for their use to CO2 capture in post-combustion streams and the
influence of activation conditions on CO2 uptake and CO2 to N2 selectivity were studied. For two monoliths with
the same open cellular foam geometry but low and high burnoff during activation, a series of fixed-bed breakthrough
adsorption experiments under typical post-combustion conditions, in a wide range of temperature (313
and 373 K), and partial pressure of CO2 up to 120 kPa were carried out. It is shown that the higher burnoff during
activation of the 3D printed carbon enhances the adsorption capacity of CO2 and N2 due to the increased specific
surface area with sorption uptakes that can reach 3.17 mol/kg at 313 K and 120 kPa. Nevertheless, the lower
burnoff time on monolith 1 leads to higher selectivity of CO2 over N2, up to 18 against 10 on monolith 2,
considering a binary interaction to a mixture of CO2/N2 (15/85 vol%) at 313 K. The single and multicomponent
adsorption equilibrium is conveniently described through the dual-site Langmuir isotherm model, while the
breakthrough curves simulated using a dynamic fixed-bed adsorption linear driving force model. Working capacities
for the 3D printed carbon with lower burnoff time lead to the best results, varying of 0.15–1.1 mol/kg for
the regeneration temperature 300–390 K. Finally, consecutive adsorption-desorption experiments show excellent
stability and regenerability for both 3D printed activated carbon monoliths and the whole study underpins the
high potential of these materials for CO2 capture in post-combustion streams.
Description
Keywords
3D printed monoliths Fixed bed adsorption Multi-component adsorption Numerical modeling Post-combustion CO2 capture
Citation
Zafanelli, Lucas F.A.S.; Henrique, Adriano; Steldinger, Hendryk; Diaz de Tuesta, Jose Luis; Gläsel, Jan; Rodrigues, Alírio; Gomes, Helder; Etzold, Bastian J.M.; Silva, José A.C. (2022): 3D-printed activated carbon for post-combustion CO2 capture. Microporous and Mesoporous Materials. ISSN 1387-1811. 335, p. 1-13
Publisher
Elsevier