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论文类型：期刊论文

发表时间：2019-03-14

发表刊物：JOURNAL OF MATERIALS CHEMISTRY A

收录刊物：SCIE、EI

卷号：7

期号：10

页面范围：5402-5408

ISSN号：2050-7488

关键字：Carbon carbon composites; Flue gases; Gas adsorption; Nanocomposites; Porous materials; Surface chemistry, Adsorbate interactions; Adsorption capacities; Adsorption technology; Carbon composites; Carbon framework; Elevated temperature; Fabrication strategies; High adsorption capacity, Carbon dioxide

摘要：Development of porous sorbents that can selectively capture carbon dioxide (CO2) through adsorption technology from the flue gas is essential to reduce emission of CO2 to the atmosphere. However, under typical flue gas conditions (approximate to 0.15 bar of CO2 at 40-70 degrees C), the adsorption capacity and selectivity for CO2 over those for nitrogen (N-2) remain poor on traditional porous adsorbents due to weak adsorbent-adsorbate interactions. Here, we report the synthesis of hierarchically structured porous carbon composites via an interfacial assembling strategy using nanoclay LAPONITE (R), resorcinol and formaldehyde as the precursors. This fabrication strategy allows fine tuning of the surface chemistry and pore network of porous carbons with the aim of enhancing the CO2 capture capacity at elevated temperatures (e.g., 50-150 degrees C). The obtained carbon composites reach a record-high CO2/N-2 selectivity (114.3) at 70 degrees C, according to equilibrium gas adsorption analysis and dynamic breakthrough measurement associated with a high adsorption capacity of 1.7 mmol g(-1) at 1.1 bar and 70 degrees C, and 0.5 mmol g(-1) at 0.17 bar and 70 degrees C. The inorganic substance integrated 3D carbon framework is responsible for such superior CO2 capture at 70 degrees C by enhancing adsorbent-adsorbate interactions.