Metal–Organic Framework Containing Planar Metal-Binding Sites: Efficiently and Cost-Effectively Enhancing the Kinetic Separation of C₂H₂/C₂H₄

Abstract

One of the emerging problems plaguing the chemical industry today is the efficient and costeffective separation of C 2 hydrocarbons. In order to help address this problem, we report a new material, NbU-1, constructed by extremely cheap starting materials. The special structural characteristics of NbU-1 such as the planar, mixed-valence copper clusters and Lewis-basic adsorption channels enforce interactions with acetylene molecules that lead to the highest kinetic separation efficiency for C 2 H 2 /C 2 H 4 . Via DFT-D calculations, it is indicated that C 2 H 2 molecules are adsorbed onto the two adjacent Cu(I) centers, but not the usual single open metal sites of Cu centers. The reported results not only provide information for a deep investigation into the separation mechanism but also offer an alternative strategy for preparing cost-effective materials that can perform highly efficient separations of light hydrocarbons.

Designer Metal–Organic Frameworks for Size‐Exclusion‐Based Hydrocarbon Separations: Progress and Challenges

“…Another MOF material exhibiting highly efficient kinetic separation of acetylene and ethylene was recently reported by Li et al, with a formula of (NH 4 ){Cu II 3 ·[Cu II Cu I 6 (OH) 6 (Ad) 6 ] 2 } (also termed as NbU‐1, Ad = adenine). [ 59 ] The MOF was built on mixed‐valence heptanuclear Cu 7 (OH) 6 clusters and single Cu ions linked by adenine ligands. The 3D structure of NbU‐1 possesses 1D channels with a pore size of ≈4 Å.…”

Simultaneous interlayer and intralayer space control in two-dimensional metal−organic frameworks for acetylene/ethylene separation

“…Metal−organic frameworks (MOFs), or porous coordination polymers (PCPs), are emerging porous solid materials in which open lattices are formed from inorganic nodes and organic linkers 7 . Owing to their inherent diversity, these materials enable precise control of pore shape, pore chemistry and pore size, thereby providing a versatile platform for separation processes [8][9][10][11][12][13][14][15] . In terms of trace gas removal, numerous studies have focused on the rational design of three-dimensional (3D) MOFs with uniform sub-nanometer pores [16][17][18][19][20][21][22][23][24][25] .…”

Efficient Separation of Acetylene and Carbon Dioxide in a Decorated Zeolite

“…[3] Adsorptive separation based upon porous sorbents affords increasing promise for gas separation at (near) ambient conditions and is attracting much interest from both academia and industry. [4][5][6][7] Va rious porous materials,s uch as activated carbons, [8] silica [9] and metal-organic frameworks (MOFs), [3,[10][11][12][13][14][15][16][17][18][19] have been studied for the adsorptive separation of C 2 H 2 /CO 2 .M OFs attracted particular attention because of their abundant structural diversity and design flexibility. [20][21][22][23][24] Zeolites,a sc onventional sorbent materials, [25,26] are potentially superior to MOFs for gas separations at an industrial scale owing to their high hydrothermal stability,recyclability and low production cost.…”