Study of the redox behaviour of high surface area CeO2–SnO2 solid solutions

Nguyễn, Thanh Bình; Deloume, J.P.; Perrichon, V.

doi:10.1016/s0926-860x(03)00223-0

Cited by 63 publications

(35 citation statements)

References 20 publications

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“…For example, Ce 0.8 Sn 0.2 O 2 and Ce 0.3 Sn 0.7 O 2 mixed oxides were found to have higher CO oxidation activity and lower values of activation energy as compare to SnO 2 and CeO 2 single oxides [9]. A similar conclusion was reached for the Ce 0.5 Sn 0.5 O 2 solid solution; moreover, the reversibility of the redox properties at moderate temperature was demonstrated [11]. Recently, a study of the Sn/CeO 2 (111)/Cu(111) model catalyst system was published [12,13].…”

Section: Introductionsupporting

confidence: 54%

Surface evolution of the Sn–Ce–O powders in various atmospheres

Scurtu

Mihaiu

Căldăraru

et al. 2011

Reac Kinet Mech Cat

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Tin and cerium based oxide ceramics, due to their peculiar properties, are good candidates for using as sensors, solid electrolytes in fuel cells, and catalysts. In the present work, Sn-Ce-O powders with the composition of interest for catalysis applications were obtained by solid state reactions and by thermal decomposition of the different tin and cerium precursors. The structural characterization of the resulted samples was performed by X-ray diffraction. Morphological characteristics were evaluated from X-ray microstructural parameters and BET surface areas measurements. Surface evolution of the studied powders was investigated by electrical measurements in various atmospheres in the 25-400°C temperature range. The samples studied behave as a n-type semiconductor. The catalytic activity for CO oxidation was measured in gas flow between 25 and 400°C. The conversion degree depends on the preparation method of the samples. Magnetic susceptibility measurements at room temperature of the samples before and after catalytic test indicated a paramagnetic behavior. Higher values of magnetic susceptibility of the samples after catalytic test compared to initial ones could indicate the influence of CeO 2 on the catalytic activity.

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Section: Introductionsupporting

confidence: 54%

Surface evolution of the Sn–Ce–O powders in various atmospheres

Scurtu

Mihaiu

Căldăraru

et al. 2011

Reac Kinet Mech Cat

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“…[1] They exhibit reducibility at lower temperatures compared to the single oxides CeO 2 and SnO 2 . [2] Previous works have reported the complex interactions of Ce and Sn oxides that are not yet fully understood. [1 -5] Model studies of metal-cerium oxide catalysts were the principal motivation for cerium oxide growth studies on transition metal substrates.…”

Section: Introductionmentioning

confidence: 99%

A resonant photoelectron spectroscopy study of Sn(O_x) doped CeO₂ catalysts

Matolín

Cabala

Cháb

et al. 2008

Surface & Interface Analysis

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The interaction of tin with cerium oxide thin film and cerium oxide nanosized powder was studied using XPS and resonant photoelectron spectroscopy (RPES) in the Ce 4d-4f photoabsorption region. A strong tin-ceria interaction led to partial Ce 4+ → Ce 3+ transition and Sn + ion formation. A corresponding increase of the Ce 4f state occupancy was observed as a giant 4f resonance enhancement. In the case of powder catalyst a strong CeO 2 -Sn interaction lead to formation of Ce-Sn-O mixed oxide system characterized by Ce 3+ ion concentration enhancement and increase of Ce 4f occupation. It explains generally higher catalytic activity of the Ce-Sn-O mixed oxide catalysts when comparing with the individual oxides.

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“…These particles adsorb gases from the ambient atmosphere and help the desired chemical reaction to run on the catalyst surface [3,8,9]. The second group is formed by other metal oxides like Al 2 O 3 , SnO 2 or V 2 O 5 that are also used separately for the catalysts' preparation as supports [10][11][12]. Depending on the strength of their interaction with CeO 2 , they can influence not only the catalyst morphology but also its chemical state.…”

Section: Introductionmentioning

confidence: 99%

“…The interaction of metallic tin with ceria leads to partial reduction of CeO 2 and oxidation of Sn [14]. The established mixed Sn-Ce-O oxide exhibits a catalytic activity higher than the individual oxides and it seems to be a very promising catalyst material [11,15,16]. The interaction of Sn with Ce probably decreases the activation energy needed for the release of oxygen necessary for the catalytic reaction to proceed [17].…”

Section: Introductionmentioning

confidence: 99%