A Microporous Metal–Organic Framework Constructed from a New Tetracarboxylic Acid for Selective Gas Separation

Abstract

A new organic ligand of pyrene-containing tetracarboxylic acid and its first metal−organic framework UTSA-72 was designed and synthesized. The MOF has the two-dimensional (4,4) framework topology. The activated UTSA-72a exhibits permanent porosity and moderately high selectivities for CO 2 /N 2 , C 2 H 2 /CH 4 , and CO 2 /CH 4 gas separations at room temperature because of the small pores within the framework.

Pyrene-based metal organic frameworks: from synthesis to applications

“…Pyrene-based MOFs can have different structural characteristics based on the size of pyrene ligand, or its stacking in the framework, resulting in different gas adsorption performances. 68,73 UTSA-72 is a 2D microporous paddle-wheel MOF which was constructed from Zn 2 (COO) 4 clusters connected by PTTB linkers. 73 Due to the presence of two kinds of cavities of 2.9 Â 2.9 Å 2 and 2.4 Â 4.6 Å 2 , UTSA-72 was investigated toward the separation of CO 2 from CH 4 and N 2 .…”

“…68,73 UTSA-72 is a 2D microporous paddle-wheel MOF which was constructed from Zn 2 (COO) 4 clusters connected by PTTB linkers. 73 Due to the presence of two kinds of cavities of 2.9 Â 2.9 Å 2 and 2.4 Â 4.6 Å 2 , UTSA-72 was investigated toward the separation of CO 2 from CH 4 and N 2 . The higher adsorption capacity of CO 2 than those of CH 4 and N 2 resulted in moderately high CO 2 /N 2 (33.4) and CO 2 /CH 4 (7.2) selectivity.…”

A Cationic MOF with High Uptake and Selectivity for CO2 due to Multiple CO2‐Philic Sites

“…[19] On decreasing the CO 2 content to 10 and1 5%,w hich correspond to those of typical flue gases in post-combustion processes, the CO 2 /N 2 selectivities at 1atm were still up to 71.1 and 78.3 (Figure 6b and Supporting Information, FigureS7), respectively,e qual to that of Cu-TDPAT, [20] and being one of the highest reported CO 2 /N 2 IAST selectivities in MOFs under similar conditions (Table 1a nd S1). [21][22][23][24][25][26][27][28][29][30][31][32] Notably,d espite the inferior adsorbed amount of CO 2 in 1a relative to some reported MOFs, [23,31,32] the combination of loading and selectivity puts 1a among the excellent MOFs for CO 2 /N 2 separation in postcombustion flue gas (Figure7).…”

Microporous metal-organic frameworks with suitable pore spaces for acetylene storage and purification

“…By immobilizing specific sites, such as open metal sites [23,24] and Lewis acidic and basic sites [25,26] into the frameworks, either high acetylene storage capacity or separation capacity has been reached in dozens of MOFs, but there are a few MOFs which exhibit both high acetylene storage capacity and separation capacity at the same time [27,28]. As for acetylene separation, optimization of both separation selectivity (mainly determined by the functional sites and size exclusive effect) and storage capacity (mainly determined by the gas storage capacities) is very important and still a challenge for researchers now.…”