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: Mesoporous calcium titanate (MCT) was synthesized via a sol-gel-hydrothermal method and investigated as a catalyst for biodiesel production from waste cooking oil (WCO) as mentioned in this paper.
69 citations
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TL;DR: The use of heterogeneous catalysts for biodiesel production aims to simplify the production process as well as to reduce purification costs and related environmental impacts as mentioned in this paper, however, the difference between this and other catalysts, the catalyst activation/deactivation mechanisms, its behaviour in the synthesis using different raw materials, and the impacts of its use on product quality remained unclear.
69 citations
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TL;DR: In this article, the solubility and stability regions for these compounds were assessed as a function of pH, and solubilities constants and conditional free energies of formation for each compound calculated from the data obtained.
Abstract: The systems Ca(II)-As(III)-H2O and Ca(II)-As(V)-H2O were studied by equilibrating mixtures of calcium oxide and arsenious or arsenic acid solution at 25°C for one month. Where the pH of the final solution was likely to be greater than 8, care was taken to exclude atmospheric carbon dioxide. Chemical analysis of the final solid phases and the associated solution from each experiment for calcium and arsenic, together with X-ray diffraction analysis of the solids and an inspection of graphed relationships, indicated the existence of the compounds Ca(AsO2)2 and CaAsO2OH 1/2H2O in the system Ca(II)-As(III)-H2O; and Ca(H2AsO4)2, CaHAsO4 H2O, Ca3(AsO4)2 4H20 and Ca2AsO4OH 2H2O in the system Ca(II)-As(V)-H2O. The solubility and stability regions for these compounds were assessed as a function of pH, and solubility constants and conditional free energies of formation for each compound calculated from the solubility data obtained. A brief historical review of literature in which calcium arsenites and calci...
69 citations
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TL;DR: The mineral characterisation has been performed using X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis and differential thermal analysis, proving the high purity of the pursued solid product when hydrated in the appropriate sodium hydroxide concentrations.
69 citations