RT Journal Article
T1 Evaluating the performance of carbon-based adsorbents fabricated from renewable biomass precursors for post-combustion CO2 capture
A1 Rahimi, Vahid
A1 Ferreiro-Salgado, Adrián
A1 Gómez Díaz, Diego
A1 Freire Leira, María Sonia
A1 González Álvarez, Julia
K1 CO2 capture
K1 Adsorption
K1 Biomass carbons
K1 CO2/N2 selectivity
K1 Fixed-bed simulation
AB The significant increase in atmospheric CO2 concentration originated mainly from fossil fuels combustion has encouraged the development and improvement of CO2 separation operations to reduce emissions and control climate change and global warming. Therefore, this work is focused on the separation of CO2 from N2 in flue gas streams under post-combustion conditions by developing low-cost adsorbents. Six carbons were fabricated from biomass resources (olive stones and almond shells) to assess their influence on CO2 adsorption capacity: One carbonized and two KOH-activated carbons with carbon/KOH ratio of 1:2 and 1:4 (w/w) for each precursor. The carbons were characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), elemental analysis, nitrogen and carbon dioxide adsorption–desorption analysis, X-ray diffraction (XRD), Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS) and point of zero charge determination. In addition, the equilibrium adsorption data of pure components for all adsorbents were measured at 0, 25 and 50 °C between 0 and 760 mmHg and CO2/N2 selectivity was determined. Activated carbons were found to have higher CO2 adsorption capacity but with a reduction in apparent selectivity. Dynamic binary adsorption simulations performed in a fixed-bed column demonstrated that the activated carbon produced from olive stones with a carbon/KOH ratio of 1:4 (w/w) can separate a mixture of 14 % CO2 and 86 % N2 at 25 and 50 °C with the highest selectivity, CO2 adsorption capacity, CO2 purity and N2 recovery factor. Reducing flow rate, the breakthrough time increased. Moreover, the breakthrough time was reduced by increasing the temperature from 25 to 50 °C owing to the exothermic nature of adsorption process.
PB Elsevier
SN 1383-5866
YR 2024
FD 2024
LK http://hdl.handle.net/10347/33702
UL http://hdl.handle.net/10347/33702
LA eng
NO Separation and Purification Technology Volume 344, 20 September 2024, 127110
NO This work is part of I+D+i project Reference PID2021-122923NB-I00 financed by MCIN/AEI /10.13039/501100011033 / FEDER, UE. Authors would like to thank the use of RIAIDT-USC analytical facilities. Authors would also like to thank Dr. Carlos A. Pena and Dr. A. Gil for their helps in performing the kinetic experiments and determining the solid density of carbons, respectively.
DS Minerva
RD 28 abr 2026