Rational Construction of Ultrahigh Thermal Stable MOF for Efficient Separation of MTO Products and Natural Gas

Abstract

Considering the important application foundation of propylene (C 3 H 6 ) and ethylene (C 2 H 4 ) production, as well as methane (CH 4 ), in petrochemical industries, this report comprehensively investigated an innovative MOF material (Zn-BPZ-SA) that was synthesized by 3,3′,5,5′-tetramethyl-4,4′bipyrazole (H 2 BPZ) and squaric acid (H 2 SA) for separating methanol-to-olefins (MTO) products (C 3 H 6 /C 2 H 4 mixtures) and natural gas (C 3 H 8 /C 2 H 6 /CH 4 mixtures). Zn-BPZ-SA with great resistance toward water and exceptional thermal stability (520 °C), can preferentially adsorb C 3 H 8 and C 3 H 6 rather than C 2 H 6 and C 2 H 4 , and in particular, reveals high C 3 H 6 and C 3 H 8 uptakes of 46.6 and 48.0 cm 3 g −1 under the crucial low pressure (10 kPa, 298 K). The experimental and simulated transient breakthroughs for C 3 H 6 /C 2 H 4 binary mixtures and C 3 H 8 /C 2 H 6 /CH 4 ternary mixtures demonstrated that the MOF can separate these mixtures with long breakthrough time differences, yielding highpurity (>99.95%) products with high productivities: C 2 H 4 (21.9−142.8 L kg −1 ) and CH 4 (34.9−73.0 L kg −1 ). The excellent separation abilities can be attributed to the rich accessbile O/N and methyl binding sites scattered at the pore surfaces in framework.

Halogen-modified metal–organic frameworks for efficient separation of alkane from natural gas

“…The excellent C 3 H 8 /C 2 H 6 adsorption capacity of DMOF-Cl exceeds those of most MOFs adsorption materials (Fig. 4c and d), such as MIL-101-Cr (3.35/1.59 mmol g −1 ), 37 ZUL-C1 (2.72/2.95 mmol g −1 ), 38 ZUL-C2 (2.52/2.82 mmol g −1 ), 38 Cu-MOF (5.98/3.22 mmol g −1 ), 39 MOF-303 (4.74/4.96 mmol g −1 ), 40 Ni(TMBDC)(DABCO) 0.5 (5.54/5.81 mmol g −1 ), 18 Zn-BPZ-SA (2.73/2.97 mmol g −1 ), 41 LIFM-ZZ-1 (4.06/2.80 mmol g −1 ), 15 PAN-m1 (3.42/2.53 mmol g −1 ), 5 and PAN-m3 (4.01/2.72 mmol g −1 ). 5…”

Increasing Mass Transfer Resistance of MOFs as a Reverse Tuning Strategy to Achieve High-Resolution Gas Chromatographic Separation

“…Metal–organic frameworks − (MOFs) are porous crystalline materials that have been utilized as separators in many fields, such as chromatography, − breakthrough, − membrane separation, − and extraction . Regulating the mass transfer of analytes in MOFs is theoretically feasible because of the designable and adjustable MOF structures .…”

Pore environment reinforced laser dye fluorescence in an adenine-containing metal–organic framework with pocket-like channels

“…Metal-organic frameworks (MOFs) are a highly versatile family of organic-inorganic hybrid porous materials [1][2][3] that have garnered significant attention in diverse fields such as luminescence sensing, [4][5][6] information anticounterfeiting, 7,8 hydrocarbon separation, 9,10 and energy storage. 11,12 In recent years, the introduction of biomolecular ligands into MOFs has led to the discovery and development of biological metal-organic frameworks (BioMOFs).…”