Preparation and property investigation of CeO2–ZrO2–Al2O3 oxygen-storage compounds

Zhenling, Wei; Li, Hongmei; Zhang, Xiaoyu; Yan, Songhua; Lv, Zhen; Chen, Yaoqiang; Gong, Maochu

doi:10.1016/j.jallcom.2007.01.060

Cited by 56 publications

(29 citation statements)

References 12 publications

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“…Alumina-zirconia nanocomposites are considered among advanced ceramics due to their superior mechanical properties and chemical inertness, and they have been used for wide range of applications such as biomedical implants [1,2] and structural ceramics [3,4]. One of the main reasons for improving mechanical behavior is the ability of transformation toughening which usually is induced by applied stresses to the composite structure [5,6].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and microstructural evolution of alumina–zirconia nanocomposites by microwave sintering

Benavente

Salvador

Peñaranda‐Foix

et al. 2014

Ceramics International

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Microwave sintering has emerged in recent years as a novel method for sintering a variety of materials that have shown significant advantages against conventional sintering procedures. This work involved an investigation of microwave hybrid fast firing of alumina-zirconia nanocomposites using commercial alumina powder and monoclinic nanometric zirconia. The suspensions were prepared separately in order to obtain 5, 10 and 15 vol.% of ZrO 2 in the alumina matrix. The samples were sintered in a 2 monomode microwave furnace at 2.45 GHz in air at different temperatures in the range 1200-1400 ºC with 10 min of dwelling time and 200 ºC/min of heating rate. The effect of sintering temperature in densification, mechanical properties and microstructure behaviour of the composites was investigated.Higher density, hardness and Young's modulus, excellent fracture toughness properties and homogeneous microstructure were achieved by microwave sintering in comparison to conventional heating. Microstructure analysis showed that the alumina grains had not grown significantly, indicating that the zirconia particles provided a hindering effect on the grain growth of alumina.

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Section: Introductionmentioning

confidence: 99%

Mechanical properties and microstructural evolution of alumina–zirconia nanocomposites by microwave sintering

Benavente

Salvador

Peñaranda‐Foix

et al. 2014

Ceramics International

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“…Thus, an oxidized Co state is more active toward the formation of methane at low temperatures, which proved our before research and Co addition can remarkably change the catalytic performances of Ce x Zr 12x O 2 supported Ni catalysts. Many studies 21,22 used the coprecipitation method to prepare the support materials including Ce x Zr 12x O 2 by adding the polyethylene glycol (PEG) as surfactant and dispersant. These researches find that PEG addition can improve the catalytic properties of these materials.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Methanation of Carbon Dioxide by Active Oxygen Material Ce_xZr_1−xO₂ Supported NiCo Bimetallic Nanocatalysts

Zhu

Razzaq

et al. 2013

AIChE Journal

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A series of active oxygen material Ce x Zr 12x O 2 -supported NiACo bimetallic nanosized catalysts were prepared by coprecipitation method, which is simple and fit for industrial use with lower cost than other methods. The effect of CeO 2 / ZrO 2 mole ratio, Co metal addition, and PEG-6000 addition were investigated. The catalysts were characterized through X-ray diffraction, H 2 thermal-programmed reduction, N 2 adsorption, Raman spectroscopy, CO pulse chemisorption, X-ray photoelectron spectroscopy, oxygen storage capacity, and transmission electron microscopy-energy dispersive X-ray analysis. Modifications of the structural and redox properties of these materials were evaluated in relation to their catalytic performances. Particularly, the relationship between the active oxygen sites of the catalysts and their catalytic performances was investigated. The interaction between active metals (Ni and Co) and Ce x Zr 12x O 2 support was found to be very important for catalytic performance. The active oxygen site of Ce x Zr 12x O 2 can considerably improve catalytic performance. Appropriate Co metal addition also remarkably enhanced the catalytic stability and activity. Moreover, PEG-6000 addition can improve the Brunauer-Emmett-Teller surface area and active metal dispersion of catalysts to improve their performances. The nanosized catalyst 15 wt % Ni-5 wt % Co/Ce 0.25 Zr 0.75 O 2 prepared by adding 5 wt % PEG-6000 achieved almost 85% CO 2 conversion and 98% selectivity to methane at 280 C when the gas hourly space velocity was 10,000 h 21 .

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“…A single peak at 618°C is observed. It indicates that the promotion of the reducibility at low temperature could be induced by solid solution sintering at high temperature (Balducci et al, 1995;Otsuka-Yao-Matsuo et al, 1998;Fornasiero et al, 1999;Kaspar et al, 2003a;Wei et al, 2008). The results also indicate that CZPA-S and CZPA-P supports have excellent resistance to aging.…”

Section: H 2 -Tprmentioning

confidence: 80%

“…) are efficient oxygen storage materials, which can act as catalysts themselves and significantly reduce the need for noble metals (He et al, 2003;Fagg et al, 2006;Wu et al, 2007). Researchers have focused their attention on (Ce , Zr)O 2 or (Ce , Zr , M)O 2 doped alumina (Fernandez-Garcia et al, 2000;Damyanova et al, 2002;Wei et al, 2008;Morikawa et al, 2008;Morikawa et al, 2009;Zhu et al, 2010), which is a valid combination for environmental application catalysts, such as catalysts for removal of pollutants from auto-exhaust streams. When nanophase (Ce, Zr, M)O 2 -doped alumina is deposited on cordierite ceramic honeycomb, the whole coating can be used for high-temperature catalytic applications.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of nanophase (Ce, Zr, Pr)O2-doped alumina coating on cordierite ceramic honeycomb for three-way catalysts

Tian

2012

Braz. J. Chem. Eng.

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-Nanophase (Ce, Zr, Pr)O 2 -doped alumina coatings were prepared by impregnating the cordierite ceramic honeycomb in the sol or in the slurry of already calcined powder, respectively. The effects of preparation methods on the crystal phase, texture, oxygen storage capacity (OSC), reducibility, surface morphology and thermal stability of coatings were investigated by X-ray diffraction (XRD), the Brunauer Emmet Teller (BET) method, the oxygen pulsing technique, H 2 -temperature-programmed reduction (H 2 -TPR) and scanning electron microscopy (SEM). These nanophase (Ce, Zr, Pr)O 2 -doped alumina coatings were used as supports to prepare Pd-only three-way catalysts, and evaluated with respect to catalytic activities. The results indicate that the nanophase (Ce, Zr, Pr)O 2 -doped alumina coatings prepared by the two methods have high thermal stability. However, the coating derived from the sol shows better crystalline structure, texture, reducibility and oxygen storage capacity than the coating derived from the slurry. SEM observation shows that the morphology of the coating derived from the sol is uniform and smooth. The Pd-only catalyst derived from the sol exhibits high three-way catalytic activity at low temperature and thermal stability, suggesting a great potential for applications.

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Preparation and property investigation of CeO2–ZrO2–Al2O3 oxygen-storage compounds

Cited by 56 publications

References 12 publications

Mechanical properties and microstructural evolution of alumina–zirconia nanocomposites by microwave sintering

Mechanical properties and microstructural evolution of alumina–zirconia nanocomposites by microwave sintering

Catalytic Methanation of Carbon Dioxide by Active Oxygen Material Ce_xZr_1−xO₂ Supported NiCo Bimetallic Nanocatalysts

Preparation and properties of nanophase (Ce, Zr, Pr)O2-doped alumina coating on cordierite ceramic honeycomb for three-way catalysts

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Preparation and property investigation of CeO2–ZrO2–Al2O3 oxygen-storage compounds

Cited by 56 publications

References 12 publications

Mechanical properties and microstructural evolution of alumina–zirconia nanocomposites by microwave sintering

Mechanical properties and microstructural evolution of alumina–zirconia nanocomposites by microwave sintering

Catalytic Methanation of Carbon Dioxide by Active Oxygen Material CexZr1−xO2 Supported NiCo Bimetallic Nanocatalysts

Preparation and properties of nanophase (Ce, Zr, Pr)O2-doped alumina coating on cordierite ceramic honeycomb for three-way catalysts

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Catalytic Methanation of Carbon Dioxide by Active Oxygen Material Ce_xZr_1−xO₂ Supported NiCo Bimetallic Nanocatalysts