Synthesis and Selective CO₂ Capture Properties of a Series of Hexatopic Linker-Based Metal–Organic Frameworks

Abstract

Four crystalline, porous metal-organic frameworks (MOFs), based on a new hexatopic linker, 1',2',3',4',5',6'-hexakis(4-carboxyphenyl)benzene (H6CPB), were synthesized and fully characterized. Interestingly, two members of this series exhibited new topologies, namely, htp and hhp, which were previously unseen in MOF chemistry. Gas adsorption measurements revealed that all members exhibited high CO2 selectivity over N2 and CH4. Accordingly, breakthrough measurements were performed on a representative example, in which the effective separation of CO2 from binary mixtures containing either N2 or CH4 was demonstrated without any loss in performance over three consecutive cycles.

Microporous Metal–Organic Frameworks with Hydrophilic and Hydrophobic Pores for Efficient Separation of CH4/N2 Mixture

“…31 In fact, Q st of N 2 in Cu–MOF is lower than those in other porous materials. 1,2,7,32 Therefore, the adsorption capacity of N 2 is very low, leading to the higher SSP than those in the reported materials. It should be noted that Q st of CH 4 is moderate compared to the values in other materials, which can reduce the regeneration cost since the cost of energy in the regeneration process is a major factor to be considered in the practical industrial application.…”

A Series of Metal–Organic Frameworks for Selective CO2 Capture and Catalytic Oxidative Carboxylation of Olefins

“…14,15 Numerous studies have been devoted to the development of MOFs for reversible CO2 adsorption based on the modification of their structural features and the presence of specific chemical functionalities. [16][17][18][19][20] In this sense, the synthesis of cyclic carbonate from chemical fixation of CO2 is an interesting approach to use CO2 as an abundant and non-toxic chemical feedstock. 21 There are extensive studies focused on the employment of new catalysts in the formation of cyclic carbonates from cycloaddition of CO2.…”

Three‐Dimensional Metal‐Organic Polymer of Multivalent Hexaphenylbenzene

“…For instance, Furukawa et al. reported the synthesis and selective carbon dioxide capturing of several metal‐organic frameworks using a hexatopic ligand . Mircea Dinca and co‐workers have synthesized a rigid metal‐organic framework using octatopic ligand .…”

“…hydrophilic channels across sheet encapsulating the hydrophobic HPB molecules (Figure b). Although several HPB‐based MOFs are reported, they were having a very less numbers of metal coordinating sites compared to the present one. Several coordinating site offered by K ions makes the HPB12 K ‐MOF more compact in three dimension leaving no extra voids for accommodating bigger molecules.…”