Robust Microporous Metal–Organic Frameworks for Highly Efficient and Simultaneous Removal of Propyne and Propadiene from Propylene

Abstract

Simultaneous removal of trace amounts of propyne and propadiene from propylene is an important but challenging industrial process.W ereport herein aclass of microporous metal-organic frameworks (NKMOF-1-M)w ith exceptional water stability and remarkably high uptakes for both propyne and propadiene at lowp ressures. NKMOF-1-M separated at ernary propyne/propadiene/propylene (0.5 :0.5 :99.0) mixture with the highest reported selectivity for the production of polymer-grade propylene (99.996 %) at ambient temperature, as attributed to its strong binding affinity for propyne and propadiene over propylene.Moreover,wewere able to visualizep ropyne and propadiene molecules in the single-crystal structure of NKMOF-1-M through ac onvenient approach under ambient conditions,w hich helped to precisely understand the binding sites and affinity for propyne and propadiene.T hese results provide important guidance on using ultramicroporous MOFs as physisorbent materials. Figure 4. a) Breakthrough curves of NKMOF-1-Ni (red) and NKMOF-1-Cu (blue) for propyne/propadiene/propylene(0.5 :0.5 :99) mixtures. b) Breakthrough curves of the previous benchmark material, ZU-62 (orange). c) Propyleneproductivity of benchmarkmaterials. d) Breakthrough cycling test of NKMOF-1-Ni.P

Structural Evolution from Noninterpenetrated to Interpenetrated Thorium–Organic Frameworks Exhibiting High Propyne Storage

“…For example, the C 3 H 4 capacity at 298 K is much higher than those of JXNU-6 (5.07 mmol g −1 ), 9 SIFSIX-2-Cu-i (4.46 mmol g −1 ), 16 Co-Gallate (3.75 mmol g −1 ), 17 GeFSIXdps-Cu (3.7 mmol g −1 ), 18 ZU-62 (3.64 mmol g −1 ), 19 UTSA- 200 (3.58 mmol g −1 ), 20 and NKMOF-1-Ni (3.5 mmol g −1 ). 21 The C 3 H 4 sorption amount of Th-TFBPDC is comparable to that of the top-performing SIFSIX-1-Cu (8.76 mmol g −1 ). 16 Thus, Th-TFBPDC is an excellent candidate for the storage of C 3 H 4 gas and one of the best-performing C 3 H 4 storage materials.…”

Robust metal–organic framework with abundant large electronegative sites for removal of CO2 from a ternary C2H2/C2H4/CO2 mixture

“…However, very limited MOFs have been reported for the separation of one gas from a ternary mixture. [34][35][36][37] Thus the separation of ternary gas mixtures is largely unexplored.…”

Sub‐Nanoporous Engineered Fibrous Aerogel Molecular Sieves with Nanogating Channels for Reversible Molecular Separation

“…[ 16 ] Moreover, the huge difficulty has remained of thermodynamic mode for molecular mixtures with extremely small size (<1 nm), as the sub‐1 nm molecules could not be effectively trapped due to the lacking size‐induced overlapped adsorption potential. [ 17 ] Here, we tackle the challenge of specifically separating miscible molecular mixtures with sub‐1 nm size and different polarity and propose a size‐thermodynamic dual‐driving separation mode using reversible NAMSs with precise sub‐1 nm adsorption traps. Intuitively, central to the superior sieving performance are two important factors: i) the binary molecules offer selective affinity to NAMSs due to the regulated interface interactions; and ii) ≈6 Å concentrated sub‐nanoscale pores of aerogel adsorbents conspicuously enhance the dynamic size‐screening effect (Figure S3, Supporting Information).…”