title: Enhanced CO2 Adsorption Affinity in a NbO-type MOF Constructed from a Low-Cost Diisophthalate Ligand with a Piperazine-Ring Bridge.
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.
authors.affiliation: Institute of Petrochemical Technology, Liaoning Shihua University, Fushun, 113001, Liaoning Province, PR China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Mu
authors.affiliation: Institute of Petrochemical Technology, Liaoning Shihua University, Fushun, 113001, Liaoning Province, PR China. fswhy@126.com.
authors.forename: Haiyan
authors.initials: H
authors.lastname: Wang
authors.affiliation: Research Institute of Unconventional Petroleum and Renewable Energy, China University of Petroleum (East China), 266580, Qingdao, PR China. lilj@upc.edu.cn.
authors.forename: Liangjun
authors.initials: L
authors.lastname: Li
authors.affiliation: Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, 266101, Qingdao, PR China.
authors.forename: Chao
authors.initials: C
authors.lastname: Wang
authors.affiliation: Research Institute of Unconventional Petroleum and Renewable Energy, China University of Petroleum (East China), 266580, Qingdao, PR China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Research Institute of Unconventional Petroleum and Renewable Energy, China University of Petroleum (East China), 266580, Qingdao, PR China.|Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, 266101, Qingdao, PR China.
authors.forename: Xuebo
authors.initials: X
authors.lastname: Zhao
mesh_terms: D000327:Adsorption; D002245:Carbon Dioxide / Q000302:isolation & purification*; D008024:Ligands; D008958:Models, Molecular; D009556:Niobium / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D010795:Phthalic Acids / Q000138:chemical synthesis / Q000737:chemistry*; D000077489:Piperazine; D010879:Piperazines / Q000138:chemical synthesis / Q000737:chemistry*; D016062:Porosity
chemical_list: D008024:Ligands; D009942:Organometallic Compounds; D010087:Oxides; D010795:Phthalic Acids; D010879:Piperazines; D009556:Niobium; C059768:isophthalate; D002245:Carbon Dioxide; D000077489:Piperazine
keywords: CO2 capture; Lewis basic sites; gas selectivity; metal-organic frameworks; piperazine