Gram-Scale Synthesis of an Ultrastable Microporous Metal-Organic Framework for Efficient Adsorptive Separation of C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub> and C<sub>2</sub>H<sub>2</sub>/CH<sub>4</sub>
oleh: Nuo Xu, Yunjia Jiang, Wanqi Sun, Jiahao Li, Lingyao Wang, Yujie Jin, Yuanbin Zhang, Dongmei Wang, Simon Duttwyler
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2021-08-01 |
Deskripsi
A highly water and thermally stable metal-organic framework (MOF) Zn<sub>2</sub>(Pydc)(Ata)<sub>2</sub> (<b>1</b>, H<sub>2</sub>Pydc = 3,5-pyridinedicarboxylic acid; HAta = 3-amino-1,2,4-triazole) was synthesized on a large scale using inexpensive commercially available ligands for efficient separation of C<sub>2</sub>H<sub>2</sub> from CH<sub>4</sub> and CO<sub>2</sub>. Compound <b>1</b> could take up 47.2 mL/g of C<sub>2</sub>H<sub>2</sub> under ambient conditions but only 33.0 mL/g of CO<sub>2</sub> and 19.1 mL/g of CH<sub>4</sub>. The calculated ideal absorbed solution theory (IAST) selectivities for equimolar C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub> and C<sub>2</sub>H<sub>2</sub>/CH<sub>4</sub> were 5.1 and 21.5, respectively, comparable to those many popular MOFs. The Q<sub>st</sub> values for C<sub>2</sub>H<sub>2</sub>, CO<sub>2</sub>, and CH<sub>4</sub> at a near-zero loading in <b>1</b> were 43.1, 32.1, and 22.5 kJ mol<sup>−1</sup>, respectively. The practical separation performance for C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub> mixtures was further confirmed by column breakthrough experiments.