Enhanced CO2 Adsorption Affinity in a NbO‐type MOF Constructed from a Low‐Cost Diisophthalate Ligand with a Piperazine‐Ring Bridge |
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| Authors: | Qian Mu Prof Haiyan Wang Dr Liangjun Li Chao Wang Ying Wang Prof Xuebo Zhao |
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| Institution: | 1. Institute of Petrochemical Technology, Liaoning Shihua University, Fushun, PR China;2. Research Institute of Unconventional Petroleum and Renewable Energy, China University of Petroleum (East China), Qingdao, PR China;3. Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, PR China |
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| Abstract: | A metal–organic framework (NPC‐6) with an NbO topology based on a piperazine ring‐bridged diisophthalate ligand was synthesized and characterized. The incorporated piperazine group leads to an enhanced adsorption affinity for CO2 in NPC‐6, in which the CO2 uptake is 4.83 mmol g?1 at 293 K and 1 bar, ranking among the top values of CO2 uptake on MOF materials. At 0.15 bar and 293 K, the NPC‐6 adsorbs 1.07 mmol g?1 of CO2, which is about 55.1 % higher than that of the analogue MOF NOTT‐101 under the same conditions. The enhanced CO2 uptake combined with comparable uptakes for CH4 and N2 leads to much higher selectivities for CO2/CH4 and CO2/N2 gas mixtures on NPC‐6 than on NOTT‐101. Furthermore, an N‐alkylation is used in the synthesis of the PDIA ligand, leading to a much lower cost compared with that in the synthesis of ligands in the NOTT series, as the former does not require a palladium‐based catalyst and borate esters. Thus, we conclude that NPC‐6 is a promising candidate for CO2 capture applications. |
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| Keywords: | CO2 capture gas selectivity Lewis basic sites metal– organic frameworks piperazine |
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