TY - JOUR
T1 - Evaluation of activated carbons produced from Maize Cob Waste for adsorption-based CO2 separation and biogas upgrading
AU - Surra, Elena
AU - Ribeiro, Rui P. P. L.
AU - Santos, Tiago
AU - Bernardo, Maria
AU - Mota, José P. B.
AU - Lapa, Nuno
AU - Esteves, Isabel A. A. C.
N1 - Funding Information:
info:eu-repo/grantAgreement/FCT/Investigador FCT/IF%2F01016%2F2014%2FCP1224%2FCT0003/PT#
info:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FCTM-CTM%2F30326%2F2017/PT#
info:eu-repo/grantAgreement/FCT/OE/SFRH%2FBPD%2F103533%2F2014/PT#
info:eu-repo/grantAgreement/FCT/OE/PD%2FBD%2F142951%2F2018/PT#
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50006%2F2020/PT#
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F50006%2F2020/PT#
The authors acknowledge the financial support from ERANet LAC initiative through project ELAC2014/BEE0367 (I. Esteves) and the Portuguese Foundation for Science and Technology (FCT/MCTES) through projects IF/01016/2014 (I. Esteves) and PTDC/CTM-CTM/30326/2017 (I. Esteves), the Post-Doc fellowships SFRH/BPD/ 93407/2013 and the “ Norma Transitória DL 57/2016 ” Program Contract (M. Bernardo), SFRH/BPD/103533/2014 , and the “Norma Transitória DL 57/2016” Program Contract (R. Ribeiro), and the Ph.D. grant PD/BD/142951/2018 (T. Santos). UID/AGR/04129/2020 ).
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2022/2
Y1 - 2022/2
N2 - Two activated carbons (AC) resulting from CO2 activation of Maize Cob Waste (MCW) were investigated as adsorbent materials for biogas upgrading to bio-methane applying a biorefinery concept. The porous carbons were originated from different times of activation and the one resulting from 3 h with CO2 (MCW(PA)3 h) showed better textural properties, higher working capacity, and selectivity towards CO2 than the carbon resulting from 2 h of activation (MCW(PA)2 h), making it the best candidate for biogas purification. The adsorption equilibrium measurements of CO2 and CH4 on MCW(PA)3 h carbon showed that the Sips isotherm model, as well as the Adsorption Potential Theory (APT), can be confidently employed to accurately correlate the adsorption equilibrium data of the adsorbates employed. In the range of the partial pressures typical for biogas upgrading units, MCW(PA)3 h showed higher CO2 uptakes than the ones reported for coal-based commercial ACs and similar uptakes to the ones reported for bio-based ACs. Moreover, the axial dispersed plug-flow and Linear Driving Force (LDF) approximation for lumped solid-diffusion mass transfer model used for the prediction of the dynamic behaviour of the adsorbate-adsorbent system, provided a good agreement with the experimental results, demonstrating its applicability to the studied system. This work represents the basis of future modelling works of a Pressure Swing Adsorption (PSA) cycle based on the use of MCW(PA)3 h as adsorbent material and demonstrates the high potential of this novel material to be applied in biogas upgrading processes.
AB - Two activated carbons (AC) resulting from CO2 activation of Maize Cob Waste (MCW) were investigated as adsorbent materials for biogas upgrading to bio-methane applying a biorefinery concept. The porous carbons were originated from different times of activation and the one resulting from 3 h with CO2 (MCW(PA)3 h) showed better textural properties, higher working capacity, and selectivity towards CO2 than the carbon resulting from 2 h of activation (MCW(PA)2 h), making it the best candidate for biogas purification. The adsorption equilibrium measurements of CO2 and CH4 on MCW(PA)3 h carbon showed that the Sips isotherm model, as well as the Adsorption Potential Theory (APT), can be confidently employed to accurately correlate the adsorption equilibrium data of the adsorbates employed. In the range of the partial pressures typical for biogas upgrading units, MCW(PA)3 h showed higher CO2 uptakes than the ones reported for coal-based commercial ACs and similar uptakes to the ones reported for bio-based ACs. Moreover, the axial dispersed plug-flow and Linear Driving Force (LDF) approximation for lumped solid-diffusion mass transfer model used for the prediction of the dynamic behaviour of the adsorbate-adsorbent system, provided a good agreement with the experimental results, demonstrating its applicability to the studied system. This work represents the basis of future modelling works of a Pressure Swing Adsorption (PSA) cycle based on the use of MCW(PA)3 h as adsorbent material and demonstrates the high potential of this novel material to be applied in biogas upgrading processes.
KW - Activated carbon
KW - Biogas upgrading
KW - Biomethane
KW - Gas adsorption and separation
KW - Pressure-swing adsorption (PSA)
UR - http://www.scopus.com/inward/record.url?scp=85121970550&partnerID=8YFLogxK
U2 - 10.1016/j.jece.2021.107065
DO - 10.1016/j.jece.2021.107065
M3 - Article
AN - SCOPUS:85121970550
SN - 2213-3437
VL - 10
JO - Journal of Environmental Chemical Engineering
JF - Journal of Environmental Chemical Engineering
IS - 1
M1 - 107065
ER -