XPS, AES and Auger parameter of Pd and PdO

Brun, M.; Berthet, A.; Bertolini, J.C.

doi:10.1016/s0368-2048(98)00312-0

Cited by 498 publications

(286 citation statements)

References 7 publications

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“…The binding energy of Pd after reduction was 335.2 eV, in agreement with the literature for metallic palladium (Brun et al 1999). However, after oxidation of propane (O 2 /C 3 H 8 , R=5.0 at 673 K), it is shifted to 337.2 eV for the Pd-Cl catalyst.…”

Section: X-ray Photoelectron Spectroscopy (Xps)supporting

confidence: 89%

“…No significant difference was observed for the Pd 5/2 binding energy, which was shifted towards 336.9 eV and 336.6 eV in the presence of water for Pd-Cl and Pd-acac, respectively. This value corresponds to a higher oxidation state of palladium than PdO (336.3 eV), probably Pd +x , according to the literature (Brun et al 1999).…”

Section: X-ray Photoelectron Spectroscopy (Xps)supporting

confidence: 52%

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The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts

Guimarães

Dieguez

Schmal

2004

An. Acad. Bras. Ciênc.

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The influence of the precursors on the promoting effect of ceria on Pd/Al 2 O 3 catalyst, when ceria is coated over alumina was studied. The reaction of propane oxidation proceeded under different feed conditions and the surface active sites were characterized by X-ray photoelectron spectroscopy (XPS) and in situ diffuse reflectance spectroscopy (DRS).XPS and DRS results show that PdO/Pd 0 interface are the active sites independent of the precursor, while the catalysts containing CeO 2 showed formation of palladium species in the highest oxidation state, probably PdO 2 (338 eV) after the oxidation of propane. Besides, the O/Al and O/Ce ratios evidenced the increase of oxygen storage in the presence of CeO 2 . In addition, the precursor acetylacetonate favors the oxygen storage in the lattice.

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Section: X-ray Photoelectron Spectroscopy (Xps)supporting

confidence: 89%

Section: X-ray Photoelectron Spectroscopy (Xps)supporting

confidence: 52%

The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts

Guimarães

Dieguez

Schmal

2004

An. Acad. Bras. Ciênc.

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“…8 (Fig. 3a3), which was probably assigned to PdO x based on prior reports [49][50][51]. The Pd 3d 5/2 peak of the formed PdO x remained in the temperature range of 90-280°C (Fig.…”

Section: In-situ Studies Of Composition-varied Pd-rh Bimetallic Ncs Usupporting

confidence: 64%

Evolution of surface of Pd-Rh bimetallic nanocubes and its correlation with CO oxidation

et al. 2018

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“…The Pd 3d 7/2 binding energy for metallic palladium (Pd 0 ) appears near to 334 eV, while for partially oxidized forms (Pd 2+ /Pd 4+ ) it appears at higher binding energies with values of ca. 336 and 338 eV, respectively [40]. The XPS Pd 3d region for the Pd-TiO 2 samples prepared with 0.5 and 2 wt% metal content and deposition times of 15 and 120 min is shown in Figure 5.…”

Section: Vaiano Et Al / Simultaneous Production Of Ch 4 and H 2 Fmentioning

confidence: 99%

Simultaneous Production of CH₄and H₂from Photocatalytic Reforming of Glucose Aqueous Solution on Sulfated Pd-TiO₂Catalysts

Vaiano

Iervolino

Sarno

et al. 2015

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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-In this work, the simultaneous production of CH 4 and H 2 from photocatalytic reforming of glucose aqueous solution on Pd-TiO 2 catalysts under UV light irradiation by Light-Emitting Diodes (LED) was investigated. The Pd-TiO 2 catalysts were prepared by the photodeposition method. The Pd content was in the range 0.5-2 wt% and a photodeposition time in the range 15-120 min was used. Pd-TiO 2 powders were extensively characterized by X-Ray Diffraction (XRD), S BET , X-Ray Fluorescence spectrometry (XRF), UV-Vis Diffuse Reflectance Spectra (UV-Vis DRS), TEM and X-Ray Photoelectron Spectroscopy (XPS). It was found that the lower Pd loading (0.5 wt%) and 120 min of photodeposition time allowed us to obtain homogeneously distributed metal nanoparticles of small size; it was also observed that the increase in the metal loading and deposition time led to increasing the Pd 0 species effectively deposited on the sulfated TiO 2 surface. Particle size and the oxidation state of the palladium were the main factors influencing the photocatalytic activity and selectivity. The presence of palladium on the sulfated titania surface enhanced the H 2 and CH 4 production. In fact, on the catalyst with 0.5 wt% Pd loading and 120 min of photodeposition time, H 2 production of about 26 lmol was obtained after 3 h of irradiation time, higher than that obtained with titania without Pd (about 8.5 lmol). The same result was obtained for the methane production. The initial pH of the solution strongly affected the selectivity of the system. In more acidic conditions, the production of H 2 was enhanced, while the CH 4 formation was higher under alkaline conditions.Résumé -Production simultanée de CH 4 et H 2 par réformage photocatalytique d'une solution aqueuse de glucose sur un catalyseur Pd-TiO 2 sulfaté -Dans cette recherche, la production simultanée de CH 4 et H 2 par le reformage photocatalytique de glucose sur les catalyseurs Pd-TiO 2 sous irradiation de lumière UV réalisée par des diodes électroluminescentes (LED) a été étudiée. Les échantillons de Pd-TiO 2 ont été préparés par la méthode de photodéposition. Le contenu de Pd était compris entre 0,5-2 % en poids et il a été utilisé un temps de photodéposition dans la gamme 15-20 minutes. Les poudres Pd-TiO 2 ont été caractérisées par diffraction des rayons X (XRD), surface spécifique BET (S BET ), fluorescence X (XRF), spectrométrie UV visible (UV vis DRS), microscopieThis is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.Oil & Gas Science and Technology -Rev. IFP Energies nouvelles, Vol. 70 (2015), No. 5, pp. 891-902 Ó V. Vaiano et al., published by IFP Energies nouvelles, 2015 DOI: 10.2516 électronique à transmission (TEM) et spectrométrie photo électronique X (XPS). Il a été constaté que le chargement inférieur de Pd (0,5 % en poids) et 120 minutes de temps d...

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XPS, AES and Auger parameter of Pd and PdO

Cited by 498 publications

References 7 publications

The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts

The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts

Evolution of surface of Pd-Rh bimetallic nanocubes and its correlation with CO oxidation

Simultaneous Production of CH₄and H₂from Photocatalytic Reforming of Glucose Aqueous Solution on Sulfated Pd-TiO₂Catalysts

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XPS, AES and Auger parameter of Pd and PdO

Cited by 498 publications

References 7 publications

The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts

The effect of precursors salts on surface state of Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts

Evolution of surface of Pd-Rh bimetallic nanocubes and its correlation with CO oxidation

Simultaneous Production of CH4and H2from Photocatalytic Reforming of Glucose Aqueous Solution on Sulfated Pd-TiO2Catalysts

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Simultaneous Production of CH₄and H₂from Photocatalytic Reforming of Glucose Aqueous Solution on Sulfated Pd-TiO₂Catalysts