The Adsorptive Separation of Ethylene from C₂ Hydrocarbons by Metal‐Organic Frameworks

Abstract

Separating ethylene (C 2 H 4 ) from the C 2 hydrocarbons is of prime industrial importance for the process of high-purity C 2 H 4 as an essential raw material in the petrochemical industry. Due to their similar physicochemical properties, the separation of C 2 H 4 from the C 2 hydrocarbons typically entails high-energy separation technologies such as cryogenic distillation and extraction. Alternatively, adsorption separation using metal-organic frameworks (MOFs) are low-energy separation technologies that manufacture high-purity gas under mild conditions. In this review, we summarized the recent advances in MOFs for the separation and purification of C 2 H 4 from the C 2 hydrocarbons. The mechanisms underlying separating C 2 H 4 from the C 2 hydrocarbons using MOFs are also highlighted. This review also discussed the major challenges and developments of MOFs to separate C 2 H 4 from the C 2 hydrocarbons.[a] W.

Design of a robust rod-packing scandium–organic framework for C2Hx/CO2 separation, CO2 storage, and catalytic CO2 cycloaddition

“…It is noted that the small pore with a size of 3.8 Å is obviously fitting for selective CO 2 adsorption (CO 2 , 3.18 × 3.33 × 5.36 Å 3 ; C 2 H 2 , 3.32 × 3.34 × 5.7 Å 3 ; C 2 H 4 , 3.28 × 4.18 × 4.84 Å 3 ; C 2 H 6 , 4.08 × 3.81 × 4.82 Å 3 ). 35 Combined with the bare nitrogen atoms as efficient adsorptive sites for CO 2 molecules, SNNU-616-Sc should be a good candidate for CO 2 adsorption and separation applications under low pressure. The other pore of about 12 Å is large enough to facilitate not only high-pressure storage for CO 2 , but also rapid diffusion of molecules inside the pores, which can be expected to offer a confined space to accelerate the mass transfer and facilitate the catalytic reaction.…”

Sintering of Platinum-Containing Conjugated Polymers: Gas Adsorption and Catalysis of the Formed Pt–Carbon Composites

“…In the present study, we prepared Pt–carbon hybrid materials with a controlled arrangement by sintering poly­(phenylene­ethynylene)­s containing Pt complex moieties in the main chain and studied their catalytic ability for oxidation. Metal organic frameworks (MOFs) are promising gas adsorption, separation, and sensing materials. − Pt–carbon composites in this study may be regarded as MOF derivatives from the viewpoint of the alignment of Pt atoms between organic residues. We also investigated the gas adsorption behavior of the Pt–carbon composites to obtain information on the pore distribution.…”