Publication | Closed Access
Microporous Metal–Organic Framework with a Completely Reversed Adsorption Relationship for C<sub>2</sub> Hydrocarbons at Room Temperature
79
Citations
38
References
2020
Year
As a new type of porous material, metal-organic frameworks (MOFs) have been widely studied in gas adsorption and separation, especially in C<sub>2</sub> hydrocarbons. Considering the stronger interaction between the unsaturated molecules and the metal sites, and the smaller molecular size of unsaturated molecules, the usual relationship of affinities and adsorption capacities among C<sub>2</sub> hydrocarbons in most common MOFs is C<sub>2</sub>H<sub>2</sub> > C<sub>2</sub>H<sub>4</sub> > C<sub>2</sub>H<sub>6</sub>. Herein, a unique microporous metal-organic framework, <b>NUM-7a</b> (activated <b>NUM-7</b>), with a completely reversed adsorption relationship for C<sub>2</sub> hydrocarbons (C<sub>2</sub>H<sub>6</sub> > C<sub>2</sub>H<sub>4</sub> > C<sub>2</sub>H<sub>2</sub>) has been successfully synthesized, which breaks the traditional concept of the adsorption relationship of MOFs for C<sub>2</sub> hydrocarbons. Based on this unique adsorption relationship, a green and simple one-step separation purification for a large amount of C<sub>2</sub>H<sub>4</sub> can be expected to be achieved through the selective adsorption of C<sub>2</sub>H<sub>6</sub>. In addition, <b>NUM-7a</b> also shows good selectivities in C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub> and CO<sub>2</sub>/CH<sub>4</sub>.
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