Details

Autor(en) / Beteiligte

• Bari, Gazi A. K. M. Rafiqul
• Kang, Hui-Ju
• Lee, Tae-Gyu
• Hwang, Hyun Jin
• An, Byeong-Hyeon
• Seo, Hye-Won
• Ko, Chang Hyun
• Hong, Won Hi
• Jun, Young-Si

Titel

Dual-templating-derived porous carbons for low-pressure CO2 capture

Ist Teil von

• Carbon Letters, 2023, 33(3), , pp.811-822

Ort / Verlag

Singapore: Springer Nature Singapore

Erscheinungsjahr

2023

Quelle

2022 ECC(Springer)

Beschreibungen/Notizen

• Porous carbons are considered promising for CO 2 capture due to their high-pressure capture performance, high chemical/thermal stability, and low humidity sensitivity. But, their low-pressure capture performance, selectivity toward CO 2 over N 2 , and adsorption kinetics need further improvement for practical applications. Herein, we report a novel dual-templating strategy based on molten salts (LiBr/KBr) and hydrogen-bonded triazine molecules (melamine–cyanuric acid complex, MCA) to prepare high-performance porous carbon adsorbents for low-pressure CO 2 . The comprehensive investigations of pore structure, microstructure, and chemical structure, as well as their correlation with CO 2 capture performance, reveal that the dual template plays the role of porogen for multi-hierarchical porous structure based on supermicro-/micro-/meso-/macro-pores and reactant for high N/O insertion into the carbon framework. Furthermore, they exert a synergistic but independent effect on the carbonization procedure of glucose, avoiding the counter-balance between porous structure and hetero-atom insertion. This enables the preferred formation of pyrrolic N/carboxylic acid functional groups and super-micropores of ~ 0.8 nm, while retaining the micro-/meso-/macro-pores (> 1 nm) more than 60% of the total pore volume. As a result, the dual-templated porous carbon adsorbent (MG-Br-600) simultaneously achieves a high CO 2 capture capacity of 3.95 mmol g −1 at 850 Torr and 0 °C, a CO 2 /N 2 (15:85) selectivity factor of 31 at 0 °C, and a high intra-particle diffusivity of 0.23 mmol g −1  min −0.5 without performance degradation over repeated use. With the molecular scale structure tunability and the large-scale production capability, the dual-templating strategy will offer versatile tools for designing high-performance carbon-based adsorbents for CO 2 capture.