Synthesis of Amine Modified Metal Organic Frameworks for Carbon Dioxide Capture

Abstract

The major energy needs are met by burning fossil fuels, which are among the most common fuel resources in the world. Global climate change is largely caused by energy resources like these that have high CO2 emissions. To decrease the amount of CO2 in the atmosphere, some concrete actions are needed. A method for reducing climate change and global warming is carbon capture and storage, which has shown some encouraging results. The process's most crucial component is carbon capture. Solid adsorbents have found widespread application in gas separation. In carbon capture, nonporous inorganic materials known as metal organic frameworks are used as adsorbents. This thesis focuses on the production, characterization, and adsorption and desorption studies of Copper MOF and its amine modifications using melamine, diphenylamine and hexamethylenetetramine (HMTA). MOFs offer broad surface area, particular pore sizes, affordability, and molecular sieving capability make them suitable for a variety of uses. A high-pressure sorption analyzer was used to examine the CO2 adsorption of MOF samples and desorption activities. SEM analysis was also used to examine the samples' surface features and morphology, and X-ray diffraction was used to determine the samples' crystallinity. FTIR spectroscopy was used to confirm the presence of various functional groups. The adsorption and desorption of these materials were examined at 50°C and 0–15 bar of pressure. The Cu-BTC showed a high adsorption capacity of 1.980 mmol/g. But its amine modification using diphenylamine gave the highest adsorption capacity. The introduction of amines in the MOF introduces a basic site to structure which increases the chemical interaction and selectivity of adsorption of carbon dioxide. The DPA modified copper MOF had an adsorption capacity of 2.518mmol/g at a pressure of 15bar. Although the adsorption capacity of the other two amine modified MOFs was lower. The adsorption on Melamine and HMTA modified MOF was 1.195 and 1.032 mmol/g, respectively.