Topic
Calcium oxide
About: Calcium oxide is a research topic. Over the lifetime, 7600 publications have been published within this topic receiving 66104 citations. The topic is also known as: caustic lime & quicklime.
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TL;DR: In this article, the behavior of different dopants on the performance of calcium oxide (CaO) sorbent for capturing CO2 in the presence of sulfur dioxide (SO2) was investigated.
Abstract: There is an urgent need to understand sorbent tolerance for capturing carbon dioxide (CO2) in the presence of sulfur dioxide (SO2). Sulfur oxide is emitted together with CO2 from various combustion systems and can cause severe air pollution. In this study, the behavior of different dopants on the performance of calcium oxide (CaO) sorbent for capturing CO2 in the presence of SO2 was investigated. Three main sets of experiments were carried out to study carbonation and sulfation both separately and simultaneously using a thermogravimetric analyzer (TGA). The results show that SO2 reduced the capability of the sorbents for capturing CO2 because of the competition between carbonation and sulfation reactions. Formation of calcium carbonate (CaCO3) and calcium sulfate (CaSO4) took place upon carbonation and sulfation, respectively. Our TGA and X-ray photoelectron spectroscopy (XPS) results indicate that the carbonation is totally reversible, while this is not the case with the sulfation. The permanent residual...
90 citations
TL;DR: In this article, the authors describe a quantitative mineralogical study of the hydrothermal reactions of an oil well cement with added silica and alumina, hydrated at temperatures from 200 to 350°C.
89 citations
TL;DR: In this article, the pozzolanic reaction mechanism of compound-activated red mud-coal gangue was investigated through TG, DTA, XRD, FTIR and 27 Al MAS NMR.
89 citations
TL;DR: In this paper, the absorbent for SO{sub 2} from the flue gas of a coal-fired electric power station was prepared from calcium oxide, calcium sulfate, and coal fly ash and examined for the relation between the desulfurization activity and the structure.
Abstract: The absorbent for SO{sub 2} from the flue gas of a coal-fired electric power station was prepared from calcium oxide, calcium sulfate, and coal fly ash and examined for the relation between the desulfurization activity and the structure. The activity is closely related to the progress of the hydration reaction taking place during preparation procedures. The activity increased with the hydration time and reached a maximum activity in 12 h. The hydration resulted in the formations of ettringite and calcium silicate. By elevation of the temperature for drying the hydration products, the activity markedly increased up to 400 C, which was caused by the removal of water covering the calcium component in the ettringite. For the efficient removal of SO{sub 2}, the existence of NO in the flue gas is required. NO{sub x} plays a catalytic role for oxidation of SO{sub 2} to SO{sub 3} which reacts with CaO to form CaSO{sub 4} as a final product.
88 citations
TL;DR: In this article, the surface of titanium before and after calcium-ion implantation by amounts of 1016, 1017, and 1018 ions cm−2, has been characterized using X-ray photoelectron spectroscopy (XPS).
88 citations