Assessing the Potential of Biochars Prepared by Steam-Assisted Slow Pyrolysis for CO 2 Adsorption and Separation

Valentina Gargiulo , Alicia Gomis-Berenguer (1) , Paola Giudicianni , Conchi Maria Concepcion Ovin Ania (2, 3, 4, 5) , Raffaele Ragucci , Michela Alfè

1 CSIC - Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain]
2 CRMD - Centre de Recherche sur la Matière Divisée
3 CCNY - The City College of New York
4 INCAR - Instituto Nacional del Carbon
5 CEMHTI - Conditions Extrêmes et Matériaux : Haute Température et Irradiation

he potentialities in the use of biochars prepared by steam-assisted slow pyrolysis as adsorbents of gases ofstrategic interest (N2,CO2, and CH4) and their mixtures were explored. The biochars prepared fromPopulus nigrawood andcellulosefibers exhibited a narrow microporosity, with average pore sizes ranging between 0.55 and 0.6 nm. The microporevolume increased with the pyrolysis temperature, allowing CO2and CH4uptakes at room temperature between 1.5 and 2.5mmol/g and between 0.1 and 0.5 mmol/g, respectively. These values are in line with those from the literature on biomass-derived carbon-based materials, exhibiting much higher porous features than those reported herein. As for the separation ofCO2/N2and CO2/CH4gas mixtures, data showed that the prepared biochars exhibited good selectivities for CO2over both N2and CH4: between ca. 34 and 119 for a CO2/N2mixture in typical post-combustion conditions (15:85, v/v) and between 14and 34 for a CO2/CH4mixture typical of natural gas upgrading (30:70, v/v)

Domaines: Catalyse; Matériaux; Ingénierie de l'environnement

Valentina Gargiulo, Alicia Gomis-Berenguer, Paola Giudicianni, Conchi Maria Concepcion Ovin Ania, Raffaele Ragucci, et al.. Assessing the Potential of Biochars Prepared by Steam-Assisted Slow Pyrolysis for CO 2 Adsorption and Separation. Energy & Fuels, 2018, 32 (10), pp.10218-10227. ⟨10.1021/acs.energyfuels.8b01058⟩. ⟨hal-02124890⟩