Synthesis,Structure And Environment And Energy-related Gases Adsorption Properties Of Cu-MOF Based Upon 5-(nitrogen Heterocyclic-n-yl) Isophthalate

Climate change has compelled people to seek the solution of decreasing the anthropic CO2 emmission in the air.Currently,two promising approaches may be CO2 capture from the flue gas and nature gas utilization.Due to their structural diversity and fine-tunablity and framework designability,metal-organic frameworks(MOFs),as one new kind of crystalline porous solid materials,have great potential applications in gas storage and separation.Nevertheless,there still are some problems to be solved in both CO2 capture from the flue gas and nature gas storage:(1)MOFs series for systematically exploring both of them are less,and MOFs series without open metal sites for that are also much less;(2)the systematically investigation for both of them aiming at special MOF series are also just beginning.In this dissertation,we ultilizes 5-(nitrogen heterocyclic-n-yl)isophthalate(LA-LG)and Cu paddle-wheel to construct a series of pillar-layer MOFs without open metal sites and investigate the impacts of functional group attachment or ligand enlongation of organic ligands on the structures of MOFs.Furthermore,their CO2 selective adsorption and CH4 storage properties have initially investigated:1.By the attachment of both-Cl and-CH3 functional groups and the substitution of the quinolin-5-yl toward pyridin-4-yl in the "pillar" part of the organic ligand,MOF 1 and 2 were afforded with rtl topology,inducing the tuning of their pore sizes to the suitable sizes,3.4 A(1)and 3.6 A(2).Intereingly,MOF 2 possesses the high thermal/water stability,a high CO2/N2 adsorption selectivity,a good cyclic CO2 adsorption and a fast kinetic CO2 adsorption behavior.2.By the substitution of the larger quinolin-6-yl toward pyridin-4-yl in the "pillar"part of the organic ligand,MOF 3 was obtained with pyr topology,which was the second pyr topological MOF.3.By extending this type organic ligands longer,LD,LE,LF and LG,MOF 4-7 were afforded with eea topology.With the longer organic ligand,5 possesses the higher porosity than that of 4.By the attachment of-NH2 group and the quinolin-4-yl substituting pyridin-4-yl,the framework density,pore volume,pore size of 6 and 7 are all slightly different from those of 5.At the high pressure,5 possesses the highest total volumetric CH4 adsorption uptake,182 cm3/cm3(STP),among MOF 4-7.