Ultra-microporous adsorbents prepared from vine shoots-derived biochar with high CO2 uptake and CO2/N2 selectivity

Manyà, J.J. (Universidad de Zaragoza) ; González, B. (Universidad de Zaragoza) ; Azuara, M. ; Arner, G.

Resumen: 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.

Idioma: Inglés

DOI: 10.1016/j.cej.2018.01.092

Año: 2018

Publicado en: CHEMICAL ENGINEERING JOURNAL 345 (2018), 631-639
ISSN: 1385-8947

Factor impacto JCR: 8.355 (2018)

Categ. JCR: ENGINEERING, ENVIRONMENTAL rank: 2 / 52 = 0.038 (2018) - Q1 - T1
Categ. JCR: ENGINEERING, CHEMICAL rank: 6 / 138 = 0.043 (2018) - Q1 - T1

Factor impacto SCIMAGO: 2.066 - Chemical Engineering (miscellaneous) (Q1) - Chemistry (miscellaneous) (Q1) - Industrial and Manufacturing Engineering (Q1) - Environmental Chemistry (Q1) - Engineering (miscellaneous) (Q4)

Financiación: info:eu-repo/grantAgreement/ES/DGA/FSE
Financiación: info:eu-repo/grantAgreement/ES/DGA/GPT
Financiación: info:eu-repo/grantAgreement/ES/MINECO/ENE2013-47880-C3-1-R

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Ingeniería Química (Dpto. Ing.Quím.Tecnol.Med.Amb.)