Separation of alkane and alkene mixtures by metal–organic frameworks

Abstract

Metal–organic frameworks hold great promise for the separation of alkane and alkene mixtures in light of their diverse structures, high porosity, and tunable pore dimensions and surface functionality.

Separation ofCH4/N2by an ultra‐stable metal–organic framework with the highest breakthrough selectivity

“…Moreover, the pore charge density of this material is also obtained based on theoretical calculations, and the results are displayed in Figure S1, which further confirms the nonpolar pore environment of the material. 48,[60][61][62][63][64] The experimental PXRD patterns in Figure 2A are in consistent with the simulated ones, and the experimental peak is sharp, which…”

“…Meanwhile, this material exhibits a one‐dimensional square straight pore with a nonpolar/inert pore environment. Moreover, the pore charge density of this material is also obtained based on theoretical calculations, and the results are displayed in Figure S1, which further confirms the nonpolar pore environment of the material 48,60–64 …”

Improving Ethane/Ethylene Separation Performance of Isoreticular Metal–Organic Frameworks via Substituent Engineering

“…In addition, compared to the parent compound, the methyl-functionalized framework compound ZJNU-21 displays a higher separation potential value, while lower separation potential was observed for the methoxy-and chloride-functionalized variants ZJNU-22 and ZJNU-23. Due to varied C 2 H 6 /C 2 H 4 component ratios involved in different industrial scenarios, 16 the separation involving a C 2 H 6 −C 2 H 4 mixture of 1:15 by volume was also considered herein, and the corresponding IAST calculation results are presented in Figure 4d−f. The adsorption selectivity remains almost unchanged when the C 2 H 6 /C 2 H 4 molar ratio is varied from 1:1 to 1:15 (Figure 4e).…”

“…Nonetheless, C 2 H 6 -selective MOF adsorbents are still rare presumably as a result of the metallic center of MOFs usually exhibiting high binding affinity toward the unsaturated C 2 H 4 molecule through π-complexation interactions but have recently seen an influx in various reports. 16,17 Furthermore, the majority of them have shortcomings such as inferior adsorption capacity, poor separation selectivity, high regeneration energy, or structural instability against water and even humidity.…”

Recent advances in metal–organic frameworks for gas adsorption/separation

“…In contrast, the traditional solid state absorbents (e.g., zeolite, molecular sieve, and porous carbon) do not show the notable advantages above. 36 Generally, the evaluation of the adsorption/separation performance is mainly as follows: the adsorption capacity is a parameter that directly reects the working capacity, adsorption enthalpy (Q st ) represents the enthalpy changes due to the adsorption process, ideal adsorbed solution theory (IAST) is usually the theoretical basis for evaluating the separation potential, and the breakthrough curves obtained from the breakthrough experiments are used to demonstrate the actual separation behavior of mixed gases. Based on the above parameters, we can effectively analyze the adsorption and separation performance of MOFs.…”