The existence of the different Greenhouse Gases (GhG) on the Earth’s atmosphere is one of the main factors contributing in its temperature regulation. Without these gases, life as we now it would not exist. However, human activities since the beginning of the Industrial Revolution have produced a radical increase in every GhG, specially, carbon dioxide (CO2). In order to control the CO2 amounts emitted to the atmosphere, different materials have been proposed as absorbents and adsorbents, and they are called Carbon Dioxide Scrubbers (CDS). Some of the most analysed CDS are ceramic materials, because of their profitability, carbon capture and storage (CCS) at high temperatures, cooling of the atmosphere is not needed for the removal of CO2, and they have a good chemical stability. Ceramic CDS based on an alkaline metal, such as lithium, have been widely used. In this work, it is proposed a different composite system based on Li-Ce-O, as possible ceramic CDS. Different lithium-cerium compositions were sintered at high temperatures, with a molar variance of Li/Ce (from 1/1 to 8/1). The structure was identified by X-ray diffraction (XRD) and nuclear magnetic resonance (NMR) of solids. At the same time, carbon dioxide capture efficiency was tested, and it was found that whereas the quantity of lithium is increased in the proposed composites, more than 50wt% of CO2 was captured in a saturated atmosphere, and more that 30wt% was captured in an atmosphere with a CO2-O2 mixture. Furthermore, different dynamic and isothermal thermogravimetric experiments displayed better CO2 chemisorption kinetics at high temperatures than that of Li2O. In addition, the Li-Ce-O composite systems evidenced good CO2 chemisorption-desorption (cyclic) properties, something not produced on lithium oxide.

Ceramic composite systems of Li-Ce-O as potential carbon dioxide (CO2) scrubbers

2019 Fall National Meeting

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