76986 20201023135859.0 doi 10.1016/j.cej.2018.01.092 sideral 106389 ART-2018-106389 eng (orcid)0000-0002-0118-3254 Manyà, J.J. Universidad de Zaragoza Ultra-microporous adsorbents prepared from vine shoots-derived biochar with high CO2 uptake and CO2/N2 selectivity 2018 Access copy available to the general public Unrestricted There is a growing interest in developing renewable biomass-based adsorbents to be used in numerous applications, including CO2 capture in postcombustion conditions. In the present study, several activated carbons (ACs) were produced from vine shoots-derived biochar through both physical and chemical activation using CO2 and KOH, respectively. The performance of these ACs was tested in terms of CO2 uptake capacity at an absolute pressure of 15 kPa and at different temperatures (0, 25, and 75 °C), apparent selectivity towards CO2 over N2, and isosteric heat of adsorption. At 25 °C, the chemically ACs with KOH impregnation exhibited the highest CO2 adsorption capacity, which was similar or even higher than those recently reported for a number of carbon-based adsorbents. However, the AC prepared through physical activation with CO2 at 800 °C and a soaking time of 1 h appears as the most promising adsorbent analyzed here, due to its higher CO2 uptake capacity and adsorption rate at relatively high temperature (75 °C), its relatively high selectivity at this temperature, and its apparently low energy demand for regeneration. Given that physical activation with CO2 is more feasible at industrial scale than chemical activation using corrosive alkalis, the results reported here are encouraging for further development of vine shoots-derived adsorbents. info:eu-repo/grantAgreement/ES/DGA/FSE info:eu-repo/grantAgreement/ES/DGA/GPT info:eu-repo/grantAgreement/ES/MINECO/ENE2013-47880-C3-1-R info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 8.355 2018 ENGINEERING, ENVIRONMENTAL 2 / 52 = 0.038 2018 Q1 T1 ENGINEERING, CHEMICAL 6 / 138 = 0.043 2018 Q1 T1 2.066 2018 Chemical Engineering (miscellaneous) 2018 Q1 Chemistry (miscellaneous) 2018 Q1 Industrial and Manufacturing Engineering 2018 Q1 Environmental Chemistry 2018 Q1 Engineering (miscellaneous) 2018 Q4 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion (orcid)0000-0001-7125-4997 González, B. Universidad de Zaragoza (orcid)0000-0002-7114-3506 Azuara, M. Arner, G. 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 345 (2018), 631-639 Chem. eng. j. CHEMICAL ENGINEERING JOURNAL 1385-8947 462642 http://zaguan.unizar.es/record/76986/files/texto_completo.pdf Postprint 29295 http://zaguan.unizar.es/record/76986/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:76986 articulos driver 2020-10-23-13:53:25 ARTICLE