Obtaining CeO2–ZrO2 mixed oxides by coprecipitation: role of preparation conditions

Letichevsky, Sonia; Tellez, Claudio; Avillez, Roberto R. de; Silva, Maria Isabel P. da; Fraga, Marco A.; Appel, Lucia G.

doi:10.1016/j.apcatb.2004.10.014

Cited by 175 publications

(77 citation statements)

References 24 publications

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“…Several studies [5][6][7][8] have shown that CeO 2 is an active support for water-gas shift reaction while the addition of gold further promotes this reaction [8]. However, the role of ceria as a support for noble metal-base catalyst is not only related to its high oxygen storage capacity but also to the improved dispersion of the noble metal and the promotion of the WGS reaction [9].…”

Section: Introductionmentioning

confidence: 96%

The effect of La on Au-ceria catalyst for water gas shift reaction

et al. 2007

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For Au-ceria catalysts prepared by deposition-precipitation method, catalytic performance of water gas shift reaction was studied in different La loadings. In the complete doping range, ceria retains with its cubic fluorite structures. BET, XRD, H 2 -TPR, HRTEM studies showed that La doping can improve the activity of Au-ceria catalyst by stabilizing ceria and modifying its morphology. In addition, the test of catalyst stability evaluation also proved a better stability performance of Au-ceria catalyst can be realized by appropriate La doping.

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Section: Introductionmentioning

confidence: 96%

The effect of La on Au-ceria catalyst for water gas shift reaction

et al. 2007

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“…It has been reported that the oxygen storage capacity (OSC) is generated by interconversion between Ce 4+ and Ce 3+ under oxidative and reductive conditions [5,6]. The OSC of the CeO 2 -ZrO 2 solid solution depends largely on the method of preparation; many physical properties such as crystallinity, crystallite and particle sizes, and homogeneity change depending upon its preparation methods and, thus, influence the OSC [7], and many methods such as solid-state reaction [8], high-energy milling [9], coprecipitation method [10,11], sol-gel method [12,13], citrate complex method [14], polymerized complex method [15], combustion synthesis [16,17], and hydrothermal method [18,19] have been reported.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of CeO2–ZrO2 solid solution by glycothermal method and its oxygen release capacity

Hosokawa

Imamura

Iwamoto

et al. 2011

Journal of the European Ceramic Society

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The glycothermal (GT) reaction of Ce acetate and Zr alkoxide directly yielded CeO2-ZrO2 solid solutions in a region of low Ce content ≤40 mol%. Of the CeO2-ZrO2 solid solutions obtained by the GT method and subsequent calcination at 500 or 800 ºC, the sample with 20 mol% Ce content had the largest BET surface area. This sample exhibited the highest Ce-based oxygen release capacity in the whole Ce/Zr composition range.The oxygen release capacities of CeO 2 -ZrO 2 solid solutions synthesized by the GT method were much larger than those of the samples prepared by a coprecipitation (CP) method. The Rietvelt analysis and the repetitive reduction-oxidation experiment indicated that the CeO 2 -ZrO 2 solid solution synthesized by the GT method has a homogeneous structure as compared with that prepared by the CP method.2

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“…∘ C range is due to metal oxide surface reduction, whereas above 700 ∘ C is due to bulk reduction [30,31]. It is seen that doping of ceria with 20 at.% La 3+ facilitates its reduction process, shifting surface reduction profile to lower temperatures.…”

Section: Structural Textural and Morphological Properties Ofmentioning

confidence: 88%

Novel Catalytic Systems for Hydrogen Production via the Water-Gas Shift Reaction

Petallidou

Polychronopoulou

Efstathiou

2013

Conference Papers in Energy

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The present work reports on the development of new catalysts for the production of hydrogen via the water-gas shift (WGS) reaction. In particular, the effect of Ce/La atom ratio on the catalytic performance of 0.5 wt% Pt supported on Ce 1− La O 2− ( = 0.0, 0.2, 0.5, 0.8, 1.0) mixed metal oxides for the WGS reaction was investigated. It was found that the addition of 20 at.% La 3+ in CeO 2 lattice increased significantly the catalytic activity and stability of 0.5 wt%Pt/Ce 0.8 La 0.2 O 2− solid. More precisely, a lower amount of "carbon" was accumulated on the catalyst surface, whereas surface acidity and basicity studies showed that Ce 0.8 La 0.2 O 2− had the highest concentration of labile oxygen and acid sites, and the lowest concentration of basic sites compared to the other Ce 1− La O 2− mixed metal oxide supports ( = 0.2, 0.5, 0.8).

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Obtaining CeO2–ZrO2 mixed oxides by coprecipitation: role of preparation conditions

Cited by 175 publications

References 24 publications

The effect of La on Au-ceria catalyst for water gas shift reaction

The effect of La on Au-ceria catalyst for water gas shift reaction

Synthesis of CeO2–ZrO2 solid solution by glycothermal method and its oxygen release capacity

Novel Catalytic Systems for Hydrogen Production via the Water-Gas Shift Reaction

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