CeO2–MO x (M: Zr, Ti, Cu) mixed metal oxides with enhanced oxygen storage capacity

Uzunoğlu, Aytekin; Zhang, Hangyu; Andreescu, Silvana; Stanciu, Lia

doi:10.1007/s10853-015-8939-7

Cited by 45 publications

(35 citation statements)

References 44 publications

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“…3. It was observed that compared to our previous report [7], the core-shell design of ZrO 2 /CeO 2 metal oxide nanoparticles resulted in a significant increase in the OSC of CeO 2 . The lowest oxygen storage capacity, however, was obtained from this composition among all synthesized samples.…”

Section: Methodscontrasting

confidence: 55%

“…As expected, the CuO-containing composition experienced the highest drop in the surface area which was due to the low sintering resistance of CuO and CeO 2 phases. The higher thermal stability of ZrO 2 -and TiO 2 -containing samples is attributed to the interaction of Zr 4+ and Ti 4+ ions with Ce 4+ in the lattice [7]. The OSC performance of the calcined samples is listed in Table 4.…”

Section: Methodsmentioning

confidence: 99%

“…It is known that the exhaust gas has fluctuations in O 2 content and the concentration of O 2 in the gas stream goes down and up, resulting from deviations in the stoichiometric air/fuel ratio. To remove the pollutants from the exhaust gas effectively, the stoichiometric ratio must be maintained [7]. The use of CeO 2 -based materials in threeway catalyst systems as a promoter ensures the maintenance of the air/fuel stoichiometry by acting as oxygen buffer under the mentioned conditions.…”

Section: Introductionmentioning

confidence: 99%

“…These distortions are associated with the difference in the ionic radius of Ce 4+ and Zr +4 [11,12]. The modification of the lattice with secondary ions such as Cu 2+ with different oxidation states than Ce 4+ leads to the formation of additional structural defects associated with the neutralization of the total charge in the mixed metal oxide system [7]. In our previous work, we showed that the formation of the additional structural defects is beneficial for enhanced lattice oxygen transport which in turn results in higher OSC [7].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of CeO2-based core/shell nanoparticles with high oxygen storage capacity

2017

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Ceria plays a key role in various applications including sensing and catalysis owing to its high oxygen storage capacity (OSC). The aim of this work is to prepare novel MO x /CeO 2 (M: Zr, Ti, Cu) metal oxide systems with core/shell structures using a facile two-step chemical precipitation method. The synthesized nanoparticles were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), and N 2 adsorption methods. The OSC property of the samples was evaluated using TGA analysis conducted at 600°C under reductive (5% H 2 /Ar) and oxidative (synthetic air) environments. The OSCs of the samples were found to be 130, 253, and 2098 µmol-O 2 /g for ZrO 2 /CeO 2 , TiO 2 /CeO 2 , and CuO/ CeO 2 , respectively. Effects of heat treatment on the physical and redox properties of the samples were also evaluated. In this regard, the samples were exposed to 500°C for 5 h under ambient environment. It was observed that the heat treatment induced the formation of mixed metal oxide alloys and the BET surface area of the samples diminished significantly. The OSC of the samples, however, did not experience any significant chance, which was attributed to the compensation of the loss in the surface area by the alloy formation after the heat treatment.

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Section: Methodscontrasting

confidence: 55%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis of CeO2-based core/shell nanoparticles with high oxygen storage capacity

2017

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“…However, poor thermal stability of the pure CeO 2 is disadvantageous for catalysis. The mixed metal oxides (MMOs) of CeO 2 with various transition metals have demonstrated the better oxygen storage capacity and catalytic properties than the pure CeO 2 [7,8]. In general, the activity of a catalyst is associated with various structural factors, like chemical composition, specific surface area and surface oxygen vacancies [9].…”

Section: Introductionmentioning

confidence: 99%

Ce1-xFexO2 nanocatalysts for priority organic pollutants removal through catalytic wet air oxidation

Anushree

Sharma

Kumar

2017

PAC

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A series of Ce 1-x Fe x O 2 nanocatalysts, prepared by co-precipitation method, were applied for the catalytic oxidation of priority organic pollutants present in paper industry wastewater. To investigate the synergic effect of various Fe contents, detailed characterizations of Ce 1-x Fe x O 2 were done by Raman, XPS, XRD, TEM and EDX techniques. The addition of Fe to CeO 2 lattice increased the amount of oxygen vacancies, which have an efficient role in the oxidation of organic pollutants under oxygen-rich conditions. Ce 0.4 Fe 0.6 O 2 catalyst showed the highest removal of TOC (72%), AOX (68%), chlorophenols (62%) and chloroguaicols (86%). The superior catalytic activity of Ce 0.4 Fe 0.6 O 2 is ascribed to its higher oxygen vacancy concentration. The presence of two oxidation states of Ce (4+,3+) and Fe (3+,2+) confirmed the role of redox couples in oxidation of organic pollutants.

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Catalytic Hydrogen Production from Bioethanol

Song

2017

Hydrogen Production Technologies

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CeO2–MO x (M: Zr, Ti, Cu) mixed metal oxides with enhanced oxygen storage capacity

Cited by 45 publications

References 44 publications

Synthesis of CeO2-based core/shell nanoparticles with high oxygen storage capacity

Synthesis of CeO2-based core/shell nanoparticles with high oxygen storage capacity

Ce1-xFexO2 nanocatalysts for priority organic pollutants removal through catalytic wet air oxidation

Catalytic Hydrogen Production from Bioethanol

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