Details

Autor(en) / Beteiligte

• Han, Yuejiang
• Meng, Lingyi
• Liu, Yongyao
• Li, Hengbo
• Ji, Zhenyu
• Zhou, Yunzhe
• Wu, Mingyan
• Han, Zhengbo

Titel

Expanding nonpolar pore surfaces in stable ethane-selective MOF to boost ethane/ethylene separation performance

Ist Teil von

• Separation and purification technology, 2023-06, Vol.315, p.123642, Article 123642

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2023

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• By modifying more non-polar aromatic rings in the stable ethane-selective MOF (UiO-67), more C-H∙∙∙π interactions between ethane and the main framework (UiO-67-BN) are generated, thus improving C2H6/C2H4 separation while ensuring stability. [Display omitted] •With more C2H6 binding sites, C2H4 can be separated in one step.•UiO-67-BN has suitable pore size and a large number of non-polar surfaces, making it an excellent C2H6-selective adsorbent.•Compared with the basic material (UiO-67), the adsorption capacity, selectivity and actual separation time of the optimized material (UiO-67-BN) are greatly improved.•The material has good stability, soaking in water and various solvents for more than a week, the adsorption capacity remains unchanged.•This material can still maintain good separation effect under different humidity, temperature and flow rate, which meets the requirements of industrial production. Ethylene is an important raw material in chemical production. Reducing energy consumption by one-step separation of ethylene from C2H6/C2H4 mixtures is a significant and challenging task. Designing a material with high C2H6 selectivity and adsorption capacity is very demanding. Here, we report a method to improve the performance of C2H6/C2H4 separation. By changing the carboxylic ligand in UiO-67, we synthesized a new material called UiO-67-BN. At room temperature, compared with the base material UiO-67, the optimized material UiO-67-BN has a significant increase in the adsorption capacity of C2H6 and the selectivity of C2H6/C2H4 due to its suitable pore size and numerous non-polar aromatic rings on the pore surface. Theoretical calculation results reveal that the optimized material can provide more C-H∙∙∙π interactions with C2H6. The breakthrough experiments demonstrate that UiO-67-BN can efficiently capture C2H6 from 50/50 and 1/99 C2H6/C2H4 mixtures at various conditions and realize one-step acquisition of C2H4.