Quantitative XPS analysis of the oxidation state of cerium in Pt-CeO2/Al2O3 catalysts

Bak, K.; Hilaire, L.

doi:10.1016/0169-4332(93)90425-b

Cited by 40 publications

(16 citation statements)

References 14 publications

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“…This fact is pretty interesting as this component is isolated from the others at approx. 916-917 eV, as a matter of fact, one can use this peak as a quantitative probe of the amount of Ce(IV) [18,[24][25][26].…”

Section: Ce-based Conversion Coating (Ce Cc) Over Aa 2024-t3 Before Cmentioning

confidence: 99%

An Auger and XPS survey of cerium active corrosion protection for AA2024-T3 aluminum alloy

Uhart

Ledeuil

Gonbeau

et al. 2016

Applied Surface Science

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Section: Ce-based Conversion Coating (Ce Cc) Over Aa 2024-t3 Before Cmentioning

confidence: 99%

An Auger and XPS survey of cerium active corrosion protection for AA2024-T3 aluminum alloy

Uhart

Ledeuil

Gonbeau

et al. 2016

Applied Surface Science

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“…Concerning the catalytic properties, ceria has been used to oxidize gases such as methane (CH 4 ) or carbon monoxide (CO) [1][2][3][4][5]. Nanosized ceria has been used to obtain total oxidation of methane [6].…”

Section: Introductionmentioning

confidence: 99%

From cerium oxycarbonate to nanostructured ceria: Relations between synthesis, thermal process and morphologies

Bakiz

Guinneton

Dallas

et al. 2008

Journal of Crystal Growth

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“…The SCP samples present cerium as Ce 4+ . [30][31][32][33][34] Phosphorus presented only one photoemission peak, which is assigned to the P 2p 3/2 binding energy at ca. 134.0 eV (average value).…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

Phosphoric acid adsorbed on silica-ceria matrix obtained by sol-gel method: studies of local structure, texture and acid property

Pissetti

Francisco

Landers

et al. 2007

J. Braz. Chem. Soc.

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Óxidos mistos de SiO 2 /CeO 2 (designados como SC) contendo quantidades variáveis de céria, SC1 = 5,6, SC2 = 8,0 e SC3 = 13,0 (% em massa), foram preparados pelo método de processamento sol-gel e obtidos como sólidos amorfos possuindo áreas superficiais específicas de SC1 = 463, SC2 = 474 e SC3 = 460 m 2 g -1 . Íons fosfatos foram imobilizados na superfície destes sólidos, através da ligação química Ce-O-P, pela imersão de SC em uma solução de ácido fosfórico. Este procedimento produziu sólidos com as seguintes quantidades de P adsorvidas na superfície (em % atômica): SCP1 = 0,60, SCP2 = 0,71 e SCP3 = 1,63. A energia de ligação P 2p 3/2 , obtida por XPS, e o único pico observado em -10 ppm, por NMR de 31 P, revelaram que o fosfato adsorvido na superfície é a espécie H 2 PO 4 -. Utilizando-se piridina como sonda molecular, somente sítios ácidos de Brønsted foram detectados. A determinação das quantidades destes sítios ácidos, feita pela adsorção de NH 3 gasosa sobre a superfície, revelou os seguintes valores para cada sólido tratado com o íon fosfato: SCP1 = 0,37, SCP2 = 0,43 e SCP3 = 0,51 mmol g -1 .SiO 2 /CeO 2 mixed oxide (designated as SC) with variable ceria contents, SC1 = 5.6, SC2 = 8.0 and SC3 = 13.0 wt%, prepared by the sol-gel processing method, were obtained as amorphous solids possessing specific surface areas of SC1 = 463, SC2 = 474 and SC3 = 460 m 2 g -1 . Phosphate ions were immobilized onto the surface of these solids through Ce-O-P bonding by immersing SC into a phosphoric acid solution. Solids with the following P contents were obtained (in atom %): SCP1 = 0.60, SCP2 = 0.71 and SCP3 = 1.63. The binding energy peak P 2p 3/2 at ca. 134.0 eV, observed by XPS, and the 31 P MAS NMR single peak, observed at ca. -10 ppm, revealed that H 2 PO 4 -is the species present on the surface of the matrices. Using pyridine as a molecular probe, only Brønsted acid sites could be detected. The amount of these acid sites, determined by ammonia gas adsorption on the surface, reached the following values for each phosphate-treated solid: SCP1 = 0.37, SCP2 = 0.43 and SCP3 = 0.51 mmol g -1 .

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Quantitative XPS analysis of the oxidation state of cerium in Pt-CeO2/Al2O3 catalysts

Cited by 40 publications

References 14 publications

An Auger and XPS survey of cerium active corrosion protection for AA2024-T3 aluminum alloy

An Auger and XPS survey of cerium active corrosion protection for AA2024-T3 aluminum alloy

From cerium oxycarbonate to nanostructured ceria: Relations between synthesis, thermal process and morphologies

Phosphoric acid adsorbed on silica-ceria matrix obtained by sol-gel method: studies of local structure, texture and acid property

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