CO2 Capture Characteristics of MgO Produced from Calcination of Metal Organic Frameworks

As the correlation between CO2 emissions and global climate change has become increasingly clear, research has been conducted into methods to sequester Carbon Dioxide and store it instead of releasing it into the environment.1,2 Many methods for carbon capture have been formulated, but this poster focuses on CO2 capture using solid adsorbents, more specifically, the use of Magnesium Oxides to adsorb CO2. Sequestration of Carbon Dioxide using Magnesium Oxides is advantageous because of the wide availability of raw materials, low energy cost of regeneration, high adsorption capacity, and low toxicity of the adsorbents.3,4 However, conventionally prepared Magnesium Oxides lose their porous structure and therefore their adsorption capacity significantly after multiple adsorption/desorption cycles.5,6,7,8

To solve this problem, a novel method of Magnesium Oxide nanoparticle synthesis via decomposition of metal organic frameworks (MOFs) containing Magnesium was developed. To synthesize these Magnesium Oxide particles, a pre-synthesized MOF containing Magnesium was calcined in an air atmosphere. This process broke the organic ligands holding the MOF structure together, while simultaneously oxidizing the magnesium metal groups to Magnesium oxides. The composition and structure of the resulting particles were characterized using, among other methods, XRD, SEM, TEM, and BET analysis. Furthermore, the CO2 absorption capacity of the synthesized material was determined using thermal gravimetric analysis. Resulting data shows that the resulting nanoparticles have high surface area and CO2 adsorption capabilities. The most significant conclusion that can be drawn from this study is that Magnesium Oxide nanoparticles synthesized using this method are more robust than conventionally prepared Magnesium Oxides, and are able to retain higher adsorption capacities after multiple adsorption and desorption cycles.7,8

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