Design, Synthesis and Testing of Metal-Organic Frameworks as Porous Materials for Carbon Dioxide Capture /

Abstract

Abstract The CO2 concentration in the atmosphere is constantly rising mainly through industrial and power plant discharges this has led to urgent calls for strategies to reduce CO2. Metal organic frameworks (MOFs), also known as coordination polymers, represent an interesting type of solid crystalline materials that can be straight forwardly self-assembled through the coordination of metal ions/clusters with organic linkers. These unique advantages enable MOFs to be used as a highly versatile and tunable platform for exploring multifunctional MOF materials. Amine groups being basic in nature have excellent affinity towards acidic CO2 group. Amine functionalized metal organic framework materials have promising tendencies as dry adsorbents for post-combustion CO2 capture, owing to their enhanced CO2 capture capacity. This research work is focused on the synthesis of a new amino functionalized Cu based MOF using 2-aminoterephthalic as a linker. Another aspect of this research work is also to compare the the physical properties of the amine functionalized MOF with that of a MOF which does not have any amine in its structure. The adsorption capacities of these both MOFs are compared in this study to show whether amine plays a role in increasing the adsorption capacity of a MOF. The structure was confirmed by Single Crystal XRD studies. The Single Crystal XRD studies reveal that an amine functionalized MOF is prepared which has free –NH2 group aiding in the CO2 adsorption. Both the MOFs were also characterized using techniques of XRD, SEM, EDS and TGA. The N2 adsorption studies of the amine functionalized MOF was carried out to know its surface area and pore size. The CO2 adsorption study of both the MOFs tells us that the amine functionalized MOF exhibits a better CO2 capture tendency of 5.85 mmolg-1 at 25°C and 20 bar pressure as compared to the Cu-BDC MOF which has a capacity of 0.922 mmolg-1 at 10℃ and 15 bar pressure.