Asphal-derived high surface area activated porous carbons for the effective adsorption separation of ethane and ethylene

被引：107
作者：
Liang, Wanwen [1 ]
Zhang, Yufan [2 ]
Wang, Xingjie [2 ]
Wu, Ying [1 ]
Zhou, Xin [2 ]
Xiao, Jing
Li, Yingwei [1 ]
Wang, Haihui [2 ]
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, Key Lab Enhanced Heat Transfer & Energy Conversat, Guangzhou 510640, Guangdong, Peoples R China
[3] State Key Lab Subtrop Bldg Sci China, Guangzhou 510640, Guangdong, Peoples R China
来源：
CHEMICAL ENGINEERING SCIENCE | 2017年 / 162卷
基金：
中国国家自然科学基金;
关键词：
Ethane/ethylene separation; Asphalt; Porous carbons; Ethane-selective; Adsorption; METAL-ORGANIC FRAMEWORKS; SELECTIVE ADSORPTION; CO2; CAPTURE; NITROGEN; ETHANE/ETHYLENE; PERFORMANCE; ADSORBENTS; IRMOF-8; OLEFIN; ZIF-7;
D O I：
10.1016/j.ces.2017.01.003
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
We reported novel asphalt-based activated carbons (A-ACs) with high C2H6/C2H4 adsorption capacity and selectivity. A series of A-ACs were prepared by a one-step preparation method and characterized. The adsorption performances of A-ACs for ethane/ethylene were examined. Results showed that the sample A-ACs prepared at 800 degrees C and the KOH/asphalt ratio = 4 exhibited ultra-high BET area of 3111 m(2)/g and its pore volume reached 1.92 cm(3)/g. Their surface O and N contents gradually decreased with activation temperature or KOH/asphalt ratio at which A-ACs were prepared. More interestingly, A-ACs showed significantly preferential adsorption of C2H6 over C2H4. It could be ascribed to the stronger interaction of C2H6 with the surfaces of A-ACs by hydrogen bonds compared to C2H4, which were revealed by Density functional theory calculation. Its C2H6 adsorption capacity was up to 7.2 mmol/g at 100 kPa and 25 degrees C and its C2H6/C2H4 adsorption selectivity for typical cracked gas mixture (15:1 ethylene/ethane) was in the range of 3.2-16.3 at the pressure below 100 kPa, higher than the most reported ethane adsorbents. Additionally, the isosteric heat of ethane and ethylene adsorption on A-ACs were lower than those on n-complexation adsorbents. Therefore, these excellent adsorption properties would make A-ACs as a type of promising adsorbents for adsorption separation of C2H6/C2H4. (C) 2017 Elsevier Ltd. All rights reserved.
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收藏
页码：192 / 202
页数：11
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