fig4
![Biological metal–organic frameworks for natural gas purification and MTO product separation](https://image.oaes.cc/d34186f6-1883-474c-82eb-23a819f6ebd3/cs3069.fig.4.jpg)
Figure 4. (A) Selectivity of equimolar mixtures of C3H8 over CH4 for Cu-AD-FA, Cu-AD-AA and Cu-AD-PA; (B) Selectivity of equimolar mixtures of C2H6 over CH4 for Cu-AD-FA, Cu-AD-AA and Cu-AD-PA; (C) Selectivity of equimolar mixtures of C3H6 over C2H4 for Cu-AD-FA, Cu-AD-AA and Cu-AD-PA; (D) Comparison of IAST selectivity of C3H6/C2H4 (0.5/0.5) with other reported MOFs. IAST: Ideal adsorbed solution theory; MOFs: metal–organic frameworks.