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: Kinetic studies showed that iron and aluminium anodes obey pseudo-second order kinetic, and this hybridisation is effective for sulfate removal, and that a bipolar configuration showed better results than the monopolar configuration.
43 citations
Patent•
14 Nov 2011
TL;DR: In this paper, the high strength and low permeability of pure F-fly ash cement systems is achieved by using in the composition un-densified silica fume, the amorphous silicone dioxide obtained as by products in production of ferro-silicones.
Abstract: Process for production of acid and high temperature resistant cement composites, where the matrix is alkali activated F fly ash alone, F Fly ash combined with ground slag or ground slag alone. F-fly ash produces lower quality alkali activated cement systems. On the other hand the lack of calcium oxide results in very high resistance to medium and highly concentrated inorganic or organic acids. The high strength and low permeability of pure F-fly ash cement systems is achieved by using in the composition un-densified silica fume, the amorphous silicone dioxide obtained as by products in production of ferro-silicones. Precipitated nano-particle silica made from soluble silicates and nano-particle silica fume produced by burning silicon tetra chloride in the hydrogen stream.
43 citations
TL;DR: In this paper, a pressure swing adsorption process and the development of specifically designed calcium-based sorbents for the process is presented. But the performance of the new process is limited due to the loss in capacity and slow and unmatched reaction rates of chemical-controlled carbonation and calcination.
Abstract: This paper presents a novel pressure swing adsorption process and the development of specifically designed sorbents for the process. It is operated at high temperature (650–800 °C) using the reversible reaction of calcium oxide with CO2, i.e., CaO + CO2 ⇄ CaCO3. The new process directly stores the reaction heat released from the forward reaction in the sorbent and then releases it for sorbent regeneration under reduced CO2 partial pressure, so that the need of pure oxygen for oxy-fuel combustion is avoided. Two potential problems of the new process, namely, loss in capacity and slow and unmatched reaction rates of chemical-controlled carbonation and calcination, were discussed in detail. Three specifically designed calcium-based sorbents showed stable performance during 92 isothermal carbonation–calcination cycles at either 680 or 750 °C. The calcination rate was significantly enhanced by increasing the reaction temperature and the introduction of steam to match the reaction rate of chemical-controlled ca...
43 citations
TL;DR: In this article, the authors studied the conversion of ethanol to acetone in the presence of water vapour and found the optimum catalyst composition, catalyst calcination temperature and reaction conditions and deduced the reaction mechanism.
43 citations
TL;DR: In this article, the authors proposed a direct integrated approach in which amine-bearing solvents, such as monoethanolamine (MEA), and alkaline Ca-bearing carbonates, are reacted in a slurry reaction system in two modes to facilitate the capture of CO2 using MEA and the release of CO 2 into the aqueous phase to produce higher conversions.
Abstract: One of the critical and emerging needs for sustainable energy production is the development of novel integrated approaches for the capture, conversion, and storage of CO2. In this context, carbon mineralization, which is a thermodynamically downhill route for the accelerated conversion of CO2 to water-insoluble and stable calcium and magnesium carbonates, is a sustainable approach for permanently storing CO2. However, one of the challenges with carbon mineralization has been the need for higher concentrations of CO2 to accelerate the formation of calcium and magnesium carbonates. In this study, we propose a direct integrated approach in which amine-bearing solvents, such as monoethanolamine (MEA), and alkaline Ca-bearing solids, such as calcium oxide and calcium silicate, are reacted in a slurry reaction system in two modes. These two modes involve in situ changes in the aqueous chemistry to facilitate the capture of CO2 using MEA and the release of CO2 into the aqueous phase to produce higher conversions...
43 citations