增强的CO2吸附和CO2/N2在Amine@ZIF-8材料

IF 2.8 4区工程技术 Q2 CHEMISTRY, APPLIED

Adsorption Science & Technology Pub Date : 2022-02-17 DOI:10.1155/2022/3207986

Zhijuan Zhang, Pengwei Li, Ting Zhao, Yuanhan Xia

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引用次数: 5

摘要

用甲胺（MA）、乙二胺（ED）和N，N′-二甲基乙二胺（MMEN）对ZIF-8晶体进行了成功的后合成改性，以提高其对CO2的吸附性能。结果表明，与原始ZIF-8相比，MA-ZIF-8、MMEN-ZIF-8和ED-ZIF-8的BET比表面积分别增加了118.2%、92.0%和29.8%。此外，它们的总孔体积分别增加了130.8%、100%和48.7%。胺改性的ZIF-8样品对CO2的吸附容量依次为MA−ZIF−8>MMEN−ZIF–8>ED−ZIF-8>ZIF−8。298时的CO2吸附能力 MA-ZIF-8、MMEN-ZIF-8和ED-ZIF-8上的K分别增加了118.2%、90.2%和29.8%。此外，使用amine@ZIF-80.01的样本 bar和298 K也显著改善，并遵循MA−ZIF−8的顺序 31.4>ED−ZIF−8 25.1>MMEN−ZIF−8 14.1>ZIF−8 11.5，分别增长173.0%、121.4%和22.6%。MA-ZIF-8、MMEN-ZIF-8和ED-ZIF-8上的CO2吸附等温线（Q st）都变高，而与ZIF-8相比，这些样品上N2的Q st略低。此外，在MA-ZIF-8上进行了6次重量法CO2吸附-解吸循环运行后，对CO2的吸附性能仍然很好，表明MA-ZIF8样品具有良好的再生性能，可应用于工业CO2吸附和分离。

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Enhanced CO2 Adsorption and Selectivity of CO2/N2 on Amine@ZIF-8 Materials

The ZIF-8 crystals were successfully postsynthetically modified using methylamine (MA), ethylenediamine (ED), and N, N ′ -dimethylethylenediamine (MMEN) to improve their adsorption performance toward CO2. Results showed that, compared with the original ZIF-8, the BET specific surface area of MA-ZIF-8, MMEN-ZIF-8, and ED-ZIF-8 has increased by 118.2%, 92.0%, and 29.8%, respectively. In addition, their total pore volume increased separately by 130.8%, 100%, and 48.7%. The adsorption capacities of CO2 on the amine-modified ZIF-8 samples followed the order MA − ZIF − 8 > MMEN − ZIF − 8 > ED − ZIF − 8 > ZIF − 8 . The CO2 adsorption capacities at 298 K on MA-ZIF-8, MMEN-ZIF-8, and ED-ZIF-8 were increased by 118.2%, 90.2%, and 29.8%, respectively. What is more, the CO2/N2 selectivities calculated using an IAST model of the amine@ZIF-8 samples at 0.01 bar and 298 K were also significantly improved and followed the order MA − ZIF − 8 31.4 > ED − ZIF − 8 25.1 > MMEN − ZIF − 8 14.1 > ZIF − 8 11.5 , which increased by 173.0%, 121.4%, and 22.6%, respectively. The isosteric heat of CO2 adsorption ( Q st ) on the MA-ZIF-8, MMEN-ZIF-8, and ED-ZIF-8 all becomes higher, while Q st of N2 on these samples was slightly lower in comparison with that on the ZIF-8. Furthermore, after six recycle runs of gravimetric CO2 adsorption-desorption on MA-ZIF-8, the adsorption performance of CO2 is still very good, indicating that the MA-ZIF-8 sample has good regeneration performance and can be applied into industrial CO2 adsorption and separation.

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来源期刊

Adsorption Science & Technology 工程技术-工程：化工

CiteScore

5.00

自引率

10.30%

发文量

181

审稿时长

4.5 months

期刊介绍： Adsorption Science & Technology is a peer-reviewed, open access journal devoted to studies of adsorption and desorption phenomena, which publishes original research papers and critical review articles, with occasional special issues relating to particular topics and symposia.