Active Sites Decorated Nonpolar Pore‐Based MOF for One‐step Acquisition of C₂H₄ and Recovery of C₃H₆

Abstract

Herein, a 2‐fold interpenetrated metal‐organic framework (MOF) Zn‐BPZ‐TATB with accessible N/O active sites in nonpolar pore surfaces was reported for one‐step C2H4 purification from C2H6 or C3H6 mixtures as well as recovery of C3H6 from C2H6/C3H6/C2H4 mixtures. The MOF exhibits the favorable C2H6 and C3H6 uptakes (> 100 cm3 g‐1 at 298 K under 100 kPa) as well as selective adsorption of C2H6 and C3H6 over C2H4. The C3H6‐ and C2H6‐selective feature were investigated detailedly by experimental tests as well as sorption kinetic studyies. Molecular modelling revealed the multiple interactions between C3H6 or C2H6 molecules and methyl groups as well as triazine rings in pores. Zn‐BPZ‐TATB not only can directly generate 323.4 L kg‐1 and 15.4 L kg‐1 of high‐purity (≥99.9%) C2H4 from C3H6/C2H4 and C2H6/C2H4 mixtures, but also provide a large high‐purity (≥99.5%) C3H6 recovery capacity of 60.1 L kg‐1 from C3H6/C2H4 mixtures. More importantly, the high‐purity C3H6 (≥99.5%) and C2H4 (≥99.9%) with the productivities of 38.2 and 12.7 L kg‐1 can be simultaneously obtained from C2H6/C3H6/C2H4 mixtures through a single adsorption/desorption cycle.

A Layered Hydrogen-Bonded Organic Framework with C3H6-Preferred Pores for Efficient One-Step Purification of Methanol-to-Olefins (MTO) Products

“…There is an excellent match between the experimental and simulated breakthrough curves (Figure S4). The calculated C 2 H 4 productivity is 5.7 mol kg –1 , which is the highest value and superior to that of all promising porous materials for C 2 H 4 /C 3 H 6 separation to date, such as Zn 2 (oba) 2 (dmimpym) (1.6 mol kg –1 ), Mn-dtzip (1.2 mol kg –1 ), Zn-BPZ-SA (1.0 mol kg –1 ), and Zn-BPZ-TATB (4.5 mol kg –1 ) (see Table S2). In addition, after five cycling experiments, or exposing HOF-NBDA to the atmosphere for five weeks, no obvious changes in retention time were observed (see Figure a, as well as Figure S5), simultaneously indicating that HOF-NBDA performs good reusability for C 2 H 4 /C 3 H 6 separation.…”

Recent advances on metal–organic frameworks for deep purification of olefins

“…54 In the field of gas separation, MOFs have exhibited superior performance, surpassing most other porous materials. For instance, numerous MOFs have been documented for their efficacy in purifying C 2 H 4 , 55–59 C 3 H 6 , 60–64 xylene, 65–69 as well as capturing carbon dioxide, 70–74 toxic gases 54,75–78 and so on, 79–84 showcasing high selectivity and uptake capacity. Additionally, MOFs are making strides towards commercialization and practical implementation.…”

Water-Stable Microporous Bipyrazole-Based Framework for Efficient Separation of MTO Products

“…In daily industrial productions, extractive distillation and catalytic hydrogenation are two common methods used to separate C 2 H 4 and C 3 H 6 , but these two methods are energy intensive and have security risks. 10,11 Compared with traditional separation techniques, adsorption separation can be carried out at room temperature with low energy consumption and high efficiency. 12 As a new kind of porous material, metal−organic frameworks (MOFs) are connected by metal nodes and organic connectors through coordination bonds and have a high specific surface area, high porosity, adjustable pore size, and controllable function.…”

“…However, the separation of C 2 H 4 and C 3 H 6 remains a great challenge due to the similarity of their physical properties. In daily industrial productions, extractive distillation and catalytic hydrogenation are two common methods used to separate C 2 H 4 and C 3 H 6 , but these two methods are energy intensive and have security risks. , Compared with traditional separation techniques, adsorption separation can be carried out at room temperature with low energy consumption and high efficiency …”