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Open AccessArticle

Adsorption Performance of Physically Activated Biochars for Postcombustion CO2 Capture from Dry and Humid Flue Gas

Aragón Institute of Engineering Research (I3A), Technological College of Huesca, University of Zaragoza, crta. Cuarte s/n, E-22071 Huesca, Spain
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Appl. Sci. 2020, 10(1), 376; https://doi.org/10.3390/app10010376
Received: 14 November 2019 / Revised: 20 December 2019 / Accepted: 30 December 2019 / Published: 3 January 2020
(This article belongs to the Special Issue New Carbon Materials from Biomass and Their Applications)
In the present study, the performance of four biomass-derived physically activated biochars for dynamic CO2 capture was assessed. Biochars were first produced from vine shoots and wheat straw pellets through slow pyrolysis (at pressures of 0.1 and 0.5 MPa) and then activated with CO2 (at 0.1 MPa and 800 °C) up to different degrees of burn-off. Cyclic adsorption-desorption measurements were conducted under both dry and humid conditions using a packed-bed of adsorbent at relatively short residence times of the gas phase (12–13 s). The adsorbent prepared from the vine shoots-derived biochar obtained by atmospheric pyrolysis, which showed the most hierarchical pore size distribution, exhibited a good and stable performance under dry conditions and at an adsorption temperature of 50 °C, due to the enhanced CO2 adsorption and desorption rates. However, the presence of relatively high concentrations of water vapor in the feeding gas clearly interfered with the CO2 adsorption mechanism, leading to significantly shorter breakthrough times. In this case, the highest percentages of a used bed were achieved by one of the other activated biochars tested, which was prepared from the wheat straw-derived biochar obtained by pressurized pyrolysis. View Full-Text
Keywords: postcombustion CO2 capture; biomass-based adsorbents; cyclic breakthrough measurements; selectivity CO2/N2; humid conditions; hierarchical porosity postcombustion CO2 capture; biomass-based adsorbents; cyclic breakthrough measurements; selectivity CO2/N2; humid conditions; hierarchical porosity
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MDPI and ACS Style

Manyà, J.J.; García-Morcate, D.; González, B. Adsorption Performance of Physically Activated Biochars for Postcombustion CO2 Capture from Dry and Humid Flue Gas. Appl. Sci. 2020, 10, 376. https://doi.org/10.3390/app10010376

AMA Style

Manyà JJ, García-Morcate D, González B. Adsorption Performance of Physically Activated Biochars for Postcombustion CO2 Capture from Dry and Humid Flue Gas. Applied Sciences. 2020; 10(1):376. https://doi.org/10.3390/app10010376

Chicago/Turabian Style

Manyà, Joan J.; García-Morcate, David; González, Belén. 2020. "Adsorption Performance of Physically Activated Biochars for Postcombustion CO2 Capture from Dry and Humid Flue Gas" Appl. Sci. 10, no. 1: 376. https://doi.org/10.3390/app10010376

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