Valence state and interaction of platinum and germanium on $gamma;-Al2O3 investigated by X-ray photoelectron spectroscopy

Bouwman, R.; Biloen, P.

doi:10.1016/0021-9517(77)90092-6

Cited by 90 publications

(22 citation statements)

References 5 publications

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“…BE changes in small noble metal particles are not only a result of the oxidation state but also the surrounding atoms (due to changes in the Madelung potential and relaxation). [27,28] Meanwhile, the peak at BE of 334.9 eV is consistent with Pd 0 peak position reported in the literature. [25,26] This is a very low temperature for reduction of Pd 2 + to Pd 0 with methane.…”

Section: The Nature Of the Sites Active In Methane Combustionsupporting

confidence: 89%

Evidence of the Formation of Surface Palladium Carbide during the Catalytic Combustion of Lean Methane/Air Mixtures

et al. 2014

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The catalytic combustion of <1 % methane in air over palladium‐based catalysts is investigated. The influence of operating parameters and pretreatment conditions on the activity and stability of the catalysts is studied. X‐ray photoelectron spectroscopy analysis of Pd/Al2O3 indicates the emergence of Pd carbide, even under lean conditions (0.6 % methane) and at temperatures as low as 180 °C. Significant differences were observed in the light‐off temperatures and extent of coke deposition, depending on whether the catalysts were conditioned under oxidizing or reducing conditions. The oxidized palladium catalysts were reduced by methane under reaction conditions and exhibited similar activity compared to catalysts which were activated under hydrogen. Time‐on‐stream experiments reveal that the stability of the Pd/Al2O3 catalyst reduced in hydrogen was only marginally improved compared to catalysts calcined in air.

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Section: The Nature Of the Sites Active In Methane Combustionsupporting

confidence: 89%

Evidence of the Formation of Surface Palladium Carbide during the Catalytic Combustion of Lean Methane/Air Mixtures

et al. 2014

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“…If one assumes that platinum is in the zerovalent state in the bimetallic catalyst after the reduction treatment, the higher values of the BE's should be attributed to a kind of electronic modification of the surface platinum atoms, [29]. Similar results were found for the Pt-Ge/ Al 2 0 3 system [30] and were explained on the basis of a more electrodeficient state for platinum in the bimetallic catalyst.…”

Section: Test Reactions Of the Metallic Phase And Xpssupporting

confidence: 68%

The Influence of the Preparation Method on the Behaviour of PtGe Catalysts Supported on Activated Carbon in Citral Hydrogenation

et al. 2008

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The liquid-phase citral hydrogenation carried out over PtGe catalysts prepared by different techniques and supported on activated carbon powder purified and functionalized with nitric acid (C-PN) was investigated. In catalysts prepared by conventional successive impregnation (CI), Ge does not improve in an important way either the activity or the selectivity to unsaturated alcohols. Besides, PtGe catalysts prepared by controlled surface reaction (CSR) show much better activities and selectivities to unsaturated alcohols (UA). It is needed a large concentration of Ge to polarize the carbonyl group in the case of CI catalysts because Ge is located mainly over the support and small quantities would be deposited over the Pt particles. In PtGe catalysts prepared by CSR, Ge moieties would polarize the carbonyl group since they would be placed near PtGe nanoclusters, thus giving high selectivity to UA.

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“…5-b). This component can be ascribed as PtO x or likely as PtO 2 species [38]. Table 2 shows also that a part of Pt exists as metallic platinum in the fresh catalyst, which can explain the less than expected consumption of H 2 during TPR measurement of 0.3Pt10Cu/Al catalyst.…”

Section: Characterization Resultsmentioning

confidence: 97%

Study on the catalytic oxidation of DMDS over Pt-Cu catalysts supported on Al2O3, AlSi20 and SiO2

Darif

Ojala

Piraúlt-Roy

et al. 2016

Applied Catalysis B: Environmental

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Valence state and interaction of platinum and germanium on $gamma;-Al2O3 investigated by X-ray photoelectron spectroscopy

Cited by 90 publications

References 5 publications

Evidence of the Formation of Surface Palladium Carbide during the Catalytic Combustion of Lean Methane/Air Mixtures

Evidence of the Formation of Surface Palladium Carbide during the Catalytic Combustion of Lean Methane/Air Mixtures

The Influence of the Preparation Method on the Behaviour of PtGe Catalysts Supported on Activated Carbon in Citral Hydrogenation

Study on the catalytic oxidation of DMDS over Pt-Cu catalysts supported on Al2O3, AlSi20 and SiO2

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