Examinando por Materia "Captura de CO2"

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    Ítem
    Caracterización de escoria de ferroníquel para la captura de CO2 atmosférico
    (Universidad EAFIT, 2024) Martínez Leiva, Santiago; N/A
    Mineral carbonation is the process that involves the reaction of calcium, magnesium and iron silicates, which in the presence of CO2 forms stable carbonates and represents a key strategy to guarantee the capture of CO2. This alternative within the mining context presents great potential to mitigate environmental impacts, and thus achieve sustainable mining. This study focuses on evaluating the characteristics of slag produced by the mining industry in lateritic ferronickel deposits. A bibliographic compilation of existing information was carried out, whose selection criteria focused on mineralogy, geochemistry of tailings, their composition and CO2 capture methods. The results obtained indicate the viability of considering this strategy as an alternative to reduce and mitigate environmental impacts. Detailed understanding of the geochemistry and mineralogy of these wastes generated by metal extraction can provide insight and an option to offset the production of huge amounts of waste and emissions to the environment, and thus ensure sustainable mining.
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    Ítem
    Thermodynamic analysis of CO2 removal process by adsorption on NaX
    (Universidad EAFIT, 2021) Ortega Arcila, Laura; Serquera Mesa, Sebastián; Builes Toro, Santiago
    The continuous increase of carbon dioxide concentration in the atmosphere is the main contributor to climate change. Thus, it is imperative to develop strategies that help to control manmade emissions of this gas. Carbon dioxide capture is an intensive research area that aims to decrease the energy requirements for the separation and storage of CO2. Even though absorption using an aqueous solvent is a well-established and is the most widely implemented capture technology, it requires high energy for the regeneration of the solvent due to the need to increase the temperature of the aqueous solvent, decreasing the overall efficiency of the process. Adsorption using porous solids has been presented as an alternative process to capture CO2 while decreasing the energy requirements. In the present work, a thermodynamic analysis of the CO2 removal process by adsorption using literature reported data is performed, in order to devise a framework to evaluate and compare two adsorbents under realistic process conditions. Zeolites NaX and Beta were used as case studies to evaluate the proposed model. The results show that, although bed composition profiles have similar trends for both adsorbents, there is a significant difference in the regeneration temperature of these adsorbents, since for zeolite NaX the regeneration temperature is reached around 360K when CO2 is almost pure, whereas for Beta this value is reached around 390K. Thus, NaX has a lower energy requirement than Beta for stablished process conditions. The energy penalty is 91.08 MW per molCO2 recovered for NaX and 104.28 MW per molCO2 recovered for Beta, which is consistent with the calculation of the specific thermal energy and the working capacity.