吸附
选择性
乙烯
碳纤维
材料科学
氮气
气体分离
多孔性
活性炭
分析化学(期刊)
化学
化学工程
核化学
物理化学
有机化学
催化作用
膜
复合材料
生物化学
复合数
工程类
作者
X.-T. Mu,Y.-S. Ouyang,L.-M. Pei,Z.-X. Peng,S.-Q. Shao,S.-M. Wang,H. Xiong,Y. Xiao,Qing‐Yuan Yang
标识
DOI:10.1016/j.mtchem.2022.100856
摘要
Adsorptive separation of C 2 H 6 from C 2 H 4 by adsorbents is an energy-efficient and promising method to boost the polymer grades C 2 H 4 production. However, that C 2 H 6 and C 2 H 4 display very similar physical properties, making their separation extremely challenging. In this work, by regulating the pore environment in a family of chitosan-based carbon materials (C-CTS-1, C-CTS-2, C-CTS-4, and C-CTS-6)- we target ultrahigh C 2 H 6 uptake and C 2 H 6 /C 2 H 4 separation, which exceeds most benchmark carbon materials. Explicitly, the C 2 H 6 uptake of C-CTS-2 (166 cm 3 /g at 100 kPa and 298 K) has the second-highest adsorption capacity among all the porous materials. In addition, C-CTS-2 gives C 2 H 6 /C 2 H 4 selectivity of 1.75 toward a 1:15 mixture of C 2 H 6 /C 2 H 4 . Notably, the adsorption enthalpies for C 2 H 6 in C-CTS-2 are low (21.3 kJ/mol), which will facilitate regeneration in mild conditions. Furthermore, C 2 H 6 /C 2 H 4 separation performance was confirmed by binary breakthrough experiments. Under different ethane/ethylene ratios, C-CTS-X extracts a low ethane concentration from an ethane/ethylene mixture and produces high-purity C 2 H 4 in one step. Spectroscopic measurement and diffraction analysis provide critical insight into the adsorption/separation mechanism. The nitrogen functional groups on the surface play a vital role in improving C 2 H 6 /C 2 H 4 selectivity, and the adsorption capacities depend on the pore size and micropore volume. Moreover, these robust porous materials exhibit outstanding stability (up to 800 °C) and can be easily prepared on a large scale (kg) at a low cost (∼$26 per kg), which is very significant for potential industrial applications. A series of new highly porous carbons materials were synthesized. By regulating the pore environment, ultrahigh C 2 H 6 uptake and C 2 H 6 /C 2 H 4 separation were achieved. • Four new highly porous carbons materials are synthesized. • C-CTS-2 exhibits the second-highest C 2 H 6 uptake (166 cm 3 /g) at 298K and100 kPa. • Outstanding thermal stability (up to 800 °C) and aqueous stability. • High purity (99%) of C 2 H 4 can be produced in one step.
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