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• W2255089969 abstract "Ceria (CeO2) crystalline compound is widely used as a catalyst or catalyst support and many other applications. However, the studies are continuing with a view to improving existing methods and/or developing innovative routes to obtain well-controlled shapes and sizes of ceria nanoparticles. In the present study, we report an original method to synthesize ceria nanoparticles (CeO2 and CeO2−x) by using two independent stages: (1) the precipitation of bastnäsite-rich material under hydrothermal conditions (90 and 300 °C) and (2) the calcination of powdered basnäsite-rich material at different temperatures (500, 1000 and 1600 °C) and under different atmospheres (air, Ar, N2 and secondary vacuum). In addition, simultaneous thermal analyses (TGA/DSC) coupled with gas chromatography (μGC/MS) were performed in order to investigate on the ceria formation during bastnäsite de-carbonation and its thermal behavior at high temperature (until 1600 °C) under three different gas atmospheres (air, Ar and N2). Herein, ceria was in-situ formed independently on the gas investigated atmosphere. This means that sufficient oxygen was also available in the so-called inert atmospheres (Ar and N2) to oxidize the Ce(III) contained in Ce-carbonates to Ce(IV) constituting ceria cubic structure. Moreover, μGC/MS measurements confirm that in-situ formed ceria CeO2 at about 600 °C is then partially reduced to CeO2−x at high temperature after 1000 °C because an increase in oxygen was clearly detected in expelled gas during heating process. This fundamental experimental study provides the hydrothermal conditions to which Ce fluorocarbonates could be formed in natural environments. In addition, new experimental conditions to produce ceria with oxygen vacancies CeO2−x without reducing gas agent and at lower temperature are also provided in this study." @default.
• W2255089969 created "2016-06-24" @default.
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• W2255089969 date "2016-04-01" @default.
• W2255089969 modified "2023-09-25" @default.
• W2255089969 title "Synthesis of ceria (CeO2 and CeO2−x) nanoparticles via decarbonation and Ce(III) oxydation of synthetic bastnäsite (CeCO3F)" @default.
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• W2255089969 doi "https://doi.org/10.1016/j.matchemphys.2016.01.066" @default.
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