首页|Effect of chemical activators on polyphosphazene-based hierarchical porous carbons and their good CO2 capture
Effect of chemical activators on polyphosphazene-based hierarchical porous carbons and their good CO2 capture
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NSTL
Elsevier
? 2022 Elsevier B.V.In this paper, various hierarchically porous carbons have been prepared from polyphosphazene microspheres by using different activating agents (K2CO3, KOH, or NaOH) and the effects of chemical activators on morphology, pore structure, element component and CO2 uptakes of porous carbons were investigated. With different activators, the resultant porous carbons exhibit different morphology, specific surface area, and pore size distribution (PSD). Among them, the typical sample HPCs - K2CO3 has the largest values of SBET (1681 m2 g?1), Smicro (996 m2 g?1), and Vmicro (0.46 cm3 g?1). Then, using them as sorbents for CO2 capture, their CO2 uptake capability, isosteric heat (Qst), selectivity, and reversibility were investigated and compared. Among them, HPCs - K2CO3 shows the highest uptakes of 6.4 mmol g?1 (282 mg g?1) at 273 K/1 bar and 4.3 mmol g?1 (188 mg g?1) at 298 K/1 bar. Based on the linear fitting method, this high CO2 uptake could be mainly attributed to the large micropore volume of sorbents, and also has the contribution of multiple heteroatoms in the porous carbon matrix. Furthermore, all the prepared porous carbon samples exhibit low isosteric heat (Qst) (21.24–22.13 kJ mol?1) with high CO2 uptake (4.53–6.41 mmol g?1 at 273 K), high selectivity of CO2/N2 (IAST selectivity of HPCs – K2CO3: 450 at 273 K, 160 at 298 K), and good recyclability, and the regeneration of them is easy to achieve.
Chemical activationCO2 captureHierarchical porous carbonPolyphosphazene
Wang M.、Xu Z.、Du H.、Wang S.、Fu J.
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College of Textiles Zhongyuan University of Technology
School of Material Science and Engineer Zhengzhou University
NSTL
Elsevier
