Understanding the Enhanced Separation Mechanism of C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> at Low Pressure by HKUST−1
The production of ethylene (C<sub>2</sub>H<sub>4</sub>) is typically accompanied by the formation of impurities like ethane (C<sub>2</sub>H<sub>6</sub>), making the separation of C<sub>2</sub>H<sub>4</sub> and C<sub>2</...
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2024-10-01
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| author | Wenpeng Xie Qiuju Fu Xiangjun Kong Xiangsen Yuan Lingzhi Yang Liting Yan Xuebo Zhao |
| author_facet | Wenpeng Xie Qiuju Fu Xiangjun Kong Xiangsen Yuan Lingzhi Yang Liting Yan Xuebo Zhao |
| author_sort | Wenpeng Xie |
| collection | DOAJ |
| description | The production of ethylene (C<sub>2</sub>H<sub>4</sub>) is typically accompanied by the formation of impurities like ethane (C<sub>2</sub>H<sub>6</sub>), making the separation of C<sub>2</sub>H<sub>4</sub> and C<sub>2</sub>H<sub>6</sub> crucial in industrial processes. Here, we investigated the S-shaped adsorption phenomenon of C<sub>2</sub>H<sub>6</sub> on the metal–organic framework HKUST−1. The virial equation is used to fit the C<sub>2</sub>H<sub>6</sub> and C<sub>2</sub>H<sub>4</sub> adsorption isotherms under low coverage. The results showed that the repulsion energy between neighboring C<sub>2</sub>H<sub>6</sub> molecules was significantly higher than that between neighboring C<sub>2</sub>H<sub>4</sub> molecules, which was an important reason for the lower adsorption of C<sub>2</sub>H<sub>6</sub> by HKUST−1 at low coverage. As more molecules are adsorbed, gas molecules aggregate within pores, leading to more hydrogen bonds formed between HKUST−1 and larger-sized C<sub>2</sub>H<sub>6</sub> under high coverage conditions. This phenomenon plays a crucial role in the S-shaped adsorption behavior of HKUST−1 on C<sub>2</sub>H<sub>6</sub>. Additionally, this unique adsorption behavior allows for the efficient separation of C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> mixtures at low pressures. The ideal adsorbed solution theory (IAST) selectivity of HKUST−1 for C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> mixtures was 3.78 at 283 K and 1 bar, but increased significantly to 7.53 under low pressure. This unique mechanism provides a theoretical basis for the low-pressure separation of C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> by HKUST−1 and establishes a solid foundation for future practical research applications. |
| format | Article |
| id | doaj-art-814f5a7d966946dcafdf1d5ac4aa86b8 |
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| publishDate | 2024-10-01 |
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| series | Chemistry |
| spelling | doaj-art-814f5a7d966946dcafdf1d5ac4aa86b82025-08-20T02:57:07ZengMDPI AGChemistry2624-85492024-10-01661326133510.3390/chemistry6060077Understanding the Enhanced Separation Mechanism of C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> at Low Pressure by HKUST−1Wenpeng Xie0Qiuju Fu1Xiangjun Kong2Xiangsen Yuan3Lingzhi Yang4Liting Yan5Xuebo Zhao6School of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, ChinaSchool of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, ChinaSchool of Chemistry & Chemical Engineering and Environmental Engineering, Weifang University, Weifang 261061, ChinaSchool of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, ChinaSchool of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, ChinaSchool of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, ChinaSchool of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, ChinaThe production of ethylene (C<sub>2</sub>H<sub>4</sub>) is typically accompanied by the formation of impurities like ethane (C<sub>2</sub>H<sub>6</sub>), making the separation of C<sub>2</sub>H<sub>4</sub> and C<sub>2</sub>H<sub>6</sub> crucial in industrial processes. Here, we investigated the S-shaped adsorption phenomenon of C<sub>2</sub>H<sub>6</sub> on the metal–organic framework HKUST−1. The virial equation is used to fit the C<sub>2</sub>H<sub>6</sub> and C<sub>2</sub>H<sub>4</sub> adsorption isotherms under low coverage. The results showed that the repulsion energy between neighboring C<sub>2</sub>H<sub>6</sub> molecules was significantly higher than that between neighboring C<sub>2</sub>H<sub>4</sub> molecules, which was an important reason for the lower adsorption of C<sub>2</sub>H<sub>6</sub> by HKUST−1 at low coverage. As more molecules are adsorbed, gas molecules aggregate within pores, leading to more hydrogen bonds formed between HKUST−1 and larger-sized C<sub>2</sub>H<sub>6</sub> under high coverage conditions. This phenomenon plays a crucial role in the S-shaped adsorption behavior of HKUST−1 on C<sub>2</sub>H<sub>6</sub>. Additionally, this unique adsorption behavior allows for the efficient separation of C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> mixtures at low pressures. The ideal adsorbed solution theory (IAST) selectivity of HKUST−1 for C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> mixtures was 3.78 at 283 K and 1 bar, but increased significantly to 7.53 under low pressure. This unique mechanism provides a theoretical basis for the low-pressure separation of C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> by HKUST−1 and establishes a solid foundation for future practical research applications.https://www.mdpi.com/2624-8549/6/6/77metal–organic frameworkethaneethyleneS-shaped adsorptionhigh IAST selectivity |
| spellingShingle | Wenpeng Xie Qiuju Fu Xiangjun Kong Xiangsen Yuan Lingzhi Yang Liting Yan Xuebo Zhao Understanding the Enhanced Separation Mechanism of C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> at Low Pressure by HKUST−1 Chemistry metal–organic framework ethane ethylene S-shaped adsorption high IAST selectivity |
| title | Understanding the Enhanced Separation Mechanism of C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> at Low Pressure by HKUST−1 |
| title_full | Understanding the Enhanced Separation Mechanism of C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> at Low Pressure by HKUST−1 |
| title_fullStr | Understanding the Enhanced Separation Mechanism of C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> at Low Pressure by HKUST−1 |
| title_full_unstemmed | Understanding the Enhanced Separation Mechanism of C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> at Low Pressure by HKUST−1 |
| title_short | Understanding the Enhanced Separation Mechanism of C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> at Low Pressure by HKUST−1 |
| title_sort | understanding the enhanced separation mechanism of c sub 2 sub h sub 4 sub c sub 2 sub h sub 6 sub at low pressure by hkust 1 |
| topic | metal–organic framework ethane ethylene S-shaped adsorption high IAST selectivity |
| url | https://www.mdpi.com/2624-8549/6/6/77 |
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