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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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Journal ArticleDOI
Haoxin Li1, Hui Zhang1, Lin Li1, Qiang Ren1, Xiaojie Yang1, Zhengwu Jiang1, Zhenlei Zhang1 
01 Nov 2019-Fuel
TL;DR: In this paper, the feasibility of utilizing low-quality desulfurization ash from semi-dry flue gas desulurization by mixing with α-hemihydrate gypsum was investigated.

116 citations

Journal ArticleDOI
TL;DR: In this article, the authors report the preliminary results of an investigation into the effects on cement chemistry of using as a feed calcium oxide (CaO) which is the spent sorbent from a promising CO2 capture process, the calcium looping cycle.
Abstract: Here, we report the preliminary results of an investigation into the effects on cement chemistry of using as a feed calcium oxide (CaO) which is the spent sorbent from a promising CO2 capture process, the calcium looping cycle.

115 citations

Journal ArticleDOI
TL;DR: In this article, the raw and calcined duck eggshells were characterized by FTIR, STA, XRD, XRF, TEM, BET, a particle size analyzer, and an impedance analyzer.
Abstract: Duck eggs are one of the most versatile cooking ingredients in which residue eggshells are discarded. Raw duck eggshells were calcined at temperatures between 300 to 900 °C, for 1, 3, and 5 h. Both the raw and calcined duck eggshells were characterized by FTIR, STA, XRD, XRF, TEM, BET, a particle size analyzer, and an impedance analyzer. The proper calcination conditions are: 900 °C and 1 h, yielding calcium oxide with a purity of 99.06 % w/w. The calcium carbonate of the rhombohedral form (CaCO3) transforms completely into the calcium oxide or lime of the face centered cubic form (CaO) at 900 °C, as shown by XRD diffraction patterns. The transmission electron microscopy (TEM) images of the calcium oxide reveal a moderately good dispersion of nearly uniform particles. The calcium oxide has a white color, a spherical shape, high porosity, and narrow particles size distribution. The percentage of ceramic yield of the calcium oxide is 53.53, as measured by STA (TG-DTA-DTG). The calcium oxide has a N2 adsorption-desorption isotherm indicating the meso-porosity range. The dielectric constant and the electrical conductivity of the calcined calcium oxide are 35 and 1:0×10−6(Ω·m)−1, respectively, at the frequency of 500 Hz.

114 citations

Journal ArticleDOI
TL;DR: The role of filler on the mechanical performance of asphalt-concrete mixture was investigated in this article, where three wearing course (W3B) mixtures incorporating granite, hydrated lime, and kaolin as filler fractions were evaluated by the Marshall mix design method to determine their optimum asphalt content.
Abstract: The role of filler on the mechanical performance of asphalt-concrete mixture was investigated. Three wearing course (W3B) mixtures incorporating granite, hydrated lime, and kaolin as filler fractions were evaluated by the Marshall mix design method to determine their optimum asphalt content. The use of hydrated lime or kaolin as a filler requires more asphalt because of their relatively higher specific surface area. The highest stiffness performance was found for W3B-hydrated lime, followed by W3B-granite, and W3B-kaolin mixtures. W3B-hydrated lime and W3B-kaolin mixtures exhibited higher deformation resistance than that of W3B-granite mixture. The results showed that the presence of filler in an asphalt-concrete mixture affects the mixture’s performance in three ways: filler influences the amount of asphalt content, filler affects the workability during mixing and compaction, and the resultant properties of asphalt-filler mastic contribute to the mixture’s performance. The results show that the properties of the filler determine its interaction with asphalt and its contribution to the mixture’s performance.

113 citations

Journal ArticleDOI
TL;DR: In this paper, a calcium oxide promoted Ni catalyst supported on a tetragonal zirconia stabilized by lanthana was used for low temperature reforming of methane by carbon dioxide.
Abstract: The low temperature reforming of methane by carbon dioxide is studied over a calcium oxide promoted Ni catalyst supported on a tetragonal zirconia stabilized by lanthana, which presents an improved stability compared to the non-promoted catalyst. Steady-state catalytic activity measurements, diffuse reflectance infrared Fourier transform spectroscopic analysis and isotopic temporal analysis of products experiments reveal the occurrence of a bifunctional mechanism on the promoted catalyst: methane is activated on the Ni particles, carbon dioxide interacts with the calcium oxide to form carbonates which scavenge carbon from nickel at the Ni-O-Ca interphase, thus restoring Ni particles to the original state. This is assumed to hinder the formation of deactivating coke, which explains the improved catalytic stability of the promoted catalyst. The main route for the carbon deposit formation is found to be the methane cracking in spite of the low temperature reaction.

112 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023101
2022186
2021116
2020234
2019350
2018432