Crystallization mechanism and catalytic properties with amount of the precipitated CePO&lt;sub&gt;4&lt;/sub&gt; for cerium phosphate glass catalyst

Chung, Jaeyeop; Kim, Jong-Hwan; Kim, Young-Seok; Choi, Soo‐Jin; Kim, Il-Gu; Park, Hyunjoon; Ryu, Bong Ki

doi:10.2109/jcersj2.123.147

Cited by 3 publications

(1 citation statement)

References 33 publications

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“…[4][5][6][7] Among the various lanthanide species, the electronic behavior of cerium stands out: the interconversion between [Xe]4f 1 (Ce(III)) and [Xe]4f 0 (Ce(IV)) underlies the many applications of cerium-based materials. 8 Cerium-containing glasses have been suggested as Faraday rotators, 9,10 catalysts, 11 scintillators, 12 and super-conductor components. 13 Furthermore, dopants of cerium play an important role as redox partner in photosensitive or photo-stabilized glasses.…”

Section: Introductionmentioning

confidence: 99%

Structure and properties of cerium phosphate and silicophosphate glasses

et al. 2022

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We report on the fabrication, properties, and structure of cerium pyrophosphate glasses and partially substituted cerium silicophosphates. In those glasses, cerium occurs predominantly as Ce(III). A combination of dynamic nuclear magnetic resonance and electrical impedance spectroscopy is used to overcome the problem of assessing cerium speciation. While optical spectroscopy is unable to quantify the ratio of Ce(III)/Ce(IV) due to spectral overlap, proxy observations of the effect of silica‐for‐cerium substitution on optical extinction and the shape and width of the UV band gap corroborate vibrational spectroscopic data of the structural roles of cerium and silica. While silica bonding to phosphate units appears to stabilize Ce(IV), it also impedes the polaron transport, leading to higher polaron activation energy and lower electronic conductivity. On the other hand, Ce(III) is stabilized by coordinating to P = O.

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Section: Introductionmentioning

confidence: 99%

Structure and properties of cerium phosphate and silicophosphate glasses

et al. 2022

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Characterization and catalytic behavior of cerium oxide doped into aluminosilicophosphate glasses

Park

Ryu

2016

J. Ceram. Soc. Japan

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Cerium oxide is commonly used as a catalyst for the oxidation of carbon monoxide (CO) in vehicle exhaust gases, and it is used as a petroleum-cracking catalyst in oil refineries. In this study, cerium aluminosilicophosphate glasses were synthesized and various physical and catalytic properties were measured, including optical properties and decomposition temperatures, by thermogravimetric analysis (TGA) and Fourier transform infrared (FT-IR) analysis. Ce 3+ /Ce 4+ ratios and structural changes in the glass attributable to doping with ³25 mol % CeO 2 were investigated by FT-IR spectroscopy and X-ray photoelectron spectroscopy (XPS) analysis. Changes in the catalytic properties of the glasses as a function of CeO 2 content were confirmed by changes in the decomposition starting temperatures. These temperatures decreased with increasing CeO 2 content of the glasses. We also discuss the role of CeO 2 in terms of the catalytic properties of the glass structure.

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Effects of melting temperature on cerium oxidation state and crystallization on catalytic properties in cerium phosphate glasses

Kim

Ryu

2017

J. Ceram. Soc. Japan

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The effect of the melting temperature on the cerium oxidation state and crystallization of cerium phosphate glasses with a molar composition 30CeO 2 70P 2 O 5 was investigated. Ce 3+ and Ce 4+ ion concentration changes in the glass attributable to the melting temperature were investigated by X-ray photoelectron spectroscopy analysis. The crystallization kinetics of the glasses and the activation energy for crystallization were evaluated under non-isothermal conditions using differential thermal analysis (DTA) performed at different heating rates. Each DTA curve exhibited one exothermic peak associated with the crystallization of the glass. The crystalline phase was identified as CePO 4 via X-ray diffractometry analysis. The Kissinger and Marotta methods were used to calculate the local activation energies for the glass samples. The amount of precipitated CePO 4 with heating at 890 K increased as the melting temperature (or Ce 3+ ) increased. The catalytic properties were studied by thermogravimetric analysis, which showed that a greater amount of precipitated CePO 4 led to poorer catalytic properties of the glass.

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Crystallization mechanism and catalytic properties with amount of the precipitated CePO<sub>4</sub> for cerium phosphate glass catalyst

Cited by 3 publications

References 33 publications

Structure and properties of cerium phosphate and silicophosphate glasses

Structure and properties of cerium phosphate and silicophosphate glasses

Characterization and catalytic behavior of cerium oxide doped into aluminosilicophosphate glasses

Effects of melting temperature on cerium oxidation state and crystallization on catalytic properties in cerium phosphate glasses

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