Single-Step Ethylene Purification and MTO Product Separation in a Nitrogen-Rich Microporous Metal-Organic Framework.

The nitrogen-rich metal-organic framework (MOF) , featuring a melamine (MA) functional group, enables efficient one-step CH purification and methanol-to-olefins (MTO) product separation. At 298 K, its adsorption capacity follows the order CH > CH > CH > CH. Breakthrough experiments showed that produced pure CH from C mixtures with a productivity of 22.5 mL g. For MTO products, productivities reached 43.0 mL g (CH) and 61.9 mL g (CH). Notably, CH addition nearly doubled the CH yield. Modeling revealed that MA aids CH/CH separation, while pocket-like apertures favor CH adsorption. Additionally, C-H···π interactions between CH and CH enhance CH yield.