Ethane-selective carbon composites CPDA@A-ACs with high uptake and its enhanced ethane/ethylene adsorption selectivity

被引：51
作者：
Liang, Wanwen [1 ]
Wu, Ying [2 ]
Xiao, Huiyu [1 ]
Xiao, Jing [2 ]
Li, Yingwei [1 ]
Li, Zhong [1 ,3 ]
机构：
[1] South China Univ Technol, Sch Chem & Chem Engn, Guangzhou 510640, Guangdong, Peoples R China
[2] South China Univ Technol, Minist Educ, Key Lab Enhanced Heat Transfer & Energy Conversat, Guangzhou 510640, Guangdong, Peoples R China
[3] South China Univ Technol, State Key Lab Subtrop Bldg Sci China, Guangzhou 510640, Guangdong, Peoples R China
来源：
AICHE JOURNAL | 2018年 / 64卷 / 09期
基金：
中国国家自然科学基金;
关键词：
ethane; ethylene separation; asphalt; polydopamine; ethane-selective; adsorption; METAL-ORGANIC FRAMEWORK; MOLECULAR-DYNAMICS SIMULATIONS; ADSORBED SOLUTION THEORY; POROUS CARBONS; PI-COMPLEXATION; SURFACE-AREA; SEPARATION; ETHYLENE; HYDROCARBONS; COMBINATION;
D O I：
10.1002/aic.16182
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Novel composites (CPDA@A-ACs) of carbonized polydopamine (CPDA) and asphalt-based activated carbons (A-ACs) were successfully synthesized, and characterized for adsorption separation of ethane/ethylene. The resulting CPDA@A-ACs exhibited high Brunauer-Emmett-Teller surface area of 1971 m(2)/g. The O and N contents on CPDA@A-ACs are higher than those on A-ACs due to the introduction of CPDA. Interestingly, CPDA@A-ACs exhibited great preferential adsorption of ethane over ethylene. Its ethane capacity reached as high as 7.12 mmol/g at 100 kPa and 25 degrees C, and its ethane/ethylene adsorption selectivity became higher compared to A-ACs, reaching as high as 3.0 approximate to 20.6 below 100 kPa, significantly superior to the reported ethane-selective adsorbents. Simulation results revealed the mechanism of enhanced selectivity toward C2H6/C2H4, and suggested that the surface oxygen functionalities of the composites play predominant role in enhancing ethane/ethylene adsorption selectivity. Fixed-bed experiments showed that C2H6/C2H4 mixtures can be well separated at room temperature, suggesting great potential for industrial C2H6/C2H4 separation. (c) 2018 American Institute of Chemical Engineers AIChE J, 64: 3390-3399, 2018
引用
收藏
页码：3390 / 3399
页数：10
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