Improving Olefin Purification Using Metal Organic Frameworks with Open Metal Sites

Abstract

The separation and purification of light hydrocarbons is challenging in the industry. Recently, a ZJNU-30 metal-organic framework (MOF) has been found to have the potential for adsorption-based separation of olefins and diolefins with four carbon atoms [H. M. Liu et al. Chem.-Eur. J. 2016, 22, 14988-14997]. Our study corroborates this finding but reveals Fe-MOF-74 as a more efficient candidate for the separation because of the open metal sites. We performed adsorption-based separation, transient breakthrough curves, and density functional theory calculations. This combination of techniques provides an extensive understanding of the studied system. Using this MOF, we propose a separation scheme to obtain a high-purity product.

Selective complexation and efficient separation of cis/trans-1,2-dichloroethene isomers by a pillar[5]arene

“…However, the examples of the physisorptive separation of cis-and transisomers are relatively scarce. [11][12][13][14] Recently, a novel class of macrocycle-based crystalline materials, termed as nonporous adaptive crystals (NACs) of pillar[n]arenes, has shown interesting adsorption/separation properties. [15][16][17][18][19][20][21] Subsequently, some new NACs based on other important macrocycles 22 such as biphen[n]arene, 23 leaning towerarene, 24,25 tiararene, 26 geminiarene, 27 hybrid [3]arene, 28 naphthotubes 29 and cucurbit [6] uril 30 have been developed.…”

Design and Experiment of Polyimide/Ti Wire Composite with the Interface Chemically Grafted through Carbon Nanotubes

“…Moreover, the distances between the six rings in the PI chain and the five‐membered centroid to the six‐ring center of the outermost wall of MWCNT was determined to be 3.422, 3.477, and 3.656 Å, respectively (inset in Figure 9k). This distance easily formed a ππ interaction, [ 42,43 ] thus enhancing the stability between molecules.…”

“…[ 45,46 ] However, the surface defects such as pores were not considered and the composition were found to be mainly Ti, O, and C. The C element was commonly ignored due to its small content; however, O was mainly found to exist in the form of hydroxyl and titanium oxide as obtained from the published XPS data. [ 42,47 ] Therefore, only the composition of titanium oxide along with its surface hydroxyl groups was considered in the model. The model of titanium oxide was first established as shown in the Supporting Information (Figure S2a, 9 nm × 9 nm × 0.8 nm, denoted as Ti@OH).…”

Thermodynamic Separation of 1-Butene from 2-Butene in Metal–Organic Frameworks with Open Metal Sites

“…Metal-organic frameworks have only been sparingly studied for C 4 hydrocarbon separations. [23][24][25][26][27][28][29][30][31][32] Two recent studies leveraged selectivity based on adsorbate size 23 or shape 24 to separate various C 4 components, although the necessarily compact framework pores preclude high capacities. One approach to engender higher capacities is to utilize frameworks containing open metal sites, which can act as strong binding sites for hydrocarbon adsorbates.…”