Poster De Conférence Année : 2025

Surface modification of commercial activated carbons for CO2 capture

Vincent Nicolas
María T. Izquierdo
Alain Celzard

Résumé

Global warming is driven by the increasing concentration of CO2 in the atmosphere, with industrial activities playing a significant role in this rise. Decarbonizing industries is therefore essential to mitigate CO2 emissions from industry. Among adsorbent materials, activated carbons (ACs) are particularly promising for CO2 capture and separation due to their high adsorption capacities and the potential to produce them from biosourced precursors. This study focused on modifying three nitrogen-free commercial ACs, MSP-20X (ABET=2320 m²/g, Vpore total=1.01 cm3/g), MSC-30 (ABET=3190 m²/g, Vpore total=1.76 cm3/g) and SA-20 (ABET=1690 m²/g, Vpore total=1.29 cm3/g), to enhance their performance. These microporous and mesoporous ACs were surface-modified using three routes. Route 1: ACs were oxidized with either H2O2 solution (35 wt. %) for 2 h or air (18 mL/min) at 400 °C for 56 min for SA-20 and 100 min for MSP-20 and MSC-30. Oxidized ACs were N-doped using ammonia (NH3 flow 30-36 mg/min) for 2 h at 200 °C. Route 2: ACs were N-doped using ammonia (NH3 flow 30-36 mg/min) for 2 h at 200 °C, 400 °C and 800 °C. Route 3: ACs were oxidized with air at either 400 °C (oxidation time: 56 min for SA-20 and 100 min for MSP-20X and MSC-30) or 800 °C (oxidation time: 10 min) and then treated with ammonia (NH3 flow 30-36 mg/min) for 2 h at 400 °C or 800 °C. Samples were characterized using N2 adsorption-desorption isotherms at -196°C. ABET of modified ACs ranged from 2070-2270 m²/g, 2970-3190 m²/g and 1350-1640 m²/g for MSP-20X, MSC-30 and SA-20, respectively. Their total porous volumes were 0.90-1.00 cm3/g, 1.66-1.70 cm3/g and 0.97-1.25 cm3/g for MSP-20X, MSC-30 and SA-20, respectively. Surface functionalities were characterized by X-ray photoelectron spectroscopy (XPS), which revealed that N-doping efficiency followed the order: MSP-20X > SA-20 > MSC-30. Nitrogen and oxygen content in modified ACs were between 0.8 - 3.9 at. % and 1.2 - 8.7 at. %, respectively. CO₂ adsorption capacities at 1 bar and 0°C demonstrated that nitrogen and oxygen surface functionalities do not improve CO₂ capture or selectivity.

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Dates et versions

hal-05270728 , version 1 (20-09-2025)

Identifiants

  • HAL Id : hal-05270728 , version 1

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Kouassi Fabrice N'Gole, Rafael Augusto MORALES OSPINO, Laurence Reinert, Bernard David, Vincent Nicolas, et al.. Surface modification of commercial activated carbons for CO2 capture. The World Conference on Carbon – Carbon 2025, Jun 2025, Saint-Malo (France), France. ⟨hal-05270728⟩
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