期刊
FUEL
卷 342, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2023.127824
关键词
Porous carbon; CO 2 adsorption; Chemical activation; Nitrogen and sulfur co -doping; Organic potassium salt
In this study, two organic potassium salts were proposed as novel and tri-functional activators for the synthesis of N, S co-doped carbons. The organic potassium salts served as activator and N/S source, allowing direct synthesis of NSCDCs with high surface area, N content, and S content.
In the current work, we proposed the use of two organic potassium salts, 4-morpholineethanesulfonic acid (MES) potassium salt and 1,4-piperazinediethanesulfonic acid (PIPES) dipotassium salt, as novel and tri-functional activators for the synthesis of N, S co-doped carbons (NSCDCs). The organic potassium salts served as acti-vator and N/S source at the same time, allowing direct synthesis of NSCDCs with N/S free precursor. In order to verify this hypothesis, N,S free hydrochar derived from glucose was selected as the carbon source. NSCDCs with high and tunable surface area (1673-2235 m2/g), N content (3.44-5.80 wt%), and S content (5.26-8.72 wt%) were obtained. Physicochemical properties of the carbons were mainly decided by potassium salt and activation temperature. The NSCDCs were also investigated for their CO2 adsorption properties. At 25 degrees C and 1 bar, high CO2 uptake of 3.04-3.99 mmol/g was achieved by the carbons. Qst of the NSCDCs was 22.6-28.7 kJ/mol, and CO2 adsorption selectivity over N2 was 10.5-17.3 at 25 degrees C and 1 bar. At 25 degrees C and 20 bar, CO2 uptake increased to 11.26-17.29 mmol/g, and exhibited linear dependence on specific surface area. The current work indicated that MES potassium salt/PIPES dipotassium salt could be used as activator for convenient synthesis of NSCDCs as efficient CO2 adsorbents.
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