CO adsorption on palladium model catalysts: XPS Pd–Al2O3 interaction study

Tsud, Nataliya; Johánek, Viktor; Stará, I.; Veltruská, Kateřina; Matolín, Vladimı́r

doi:10.1016/s0039-6028(00)00747-0

Cited by 46 publications

(28 citation statements)

References 20 publications

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“…(C) and the associated BE value (for 3d 5/2 ) is given in Table . The Pd 3d 5/2 core level BE (334.9 eV) is 0.4 eV lower than the metallic Pd reference (335.3 eV), suggesting electron transfer from the support to generate Pd δ‐ , which is consistent with the literature …”

Section: Resultssupporting

confidence: 90%

Gas phase selective hydrogenation of phenylacetylene to styrene over Au/Al₂O₃

Wang

Keane

2019

J of Chemical Tech & Biotech

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BACKGROUND Trace quantities of phenylacetylene can poison styrene polymerisation catalysts. The phenylacetylene content must be less than 10 ppm and selective hydrogenation (to styrene) is viewed as a viable process solution. High styrene selectivities have been achieved in batch liquid phase operations while a switch from conventional batch liquid to continuous gas phase reaction presents process advantages in terms of higher throughput and enhanced productivity. We aim to provide the first direct comparison of Au/Al2O3 and Pd/Al2O3 in gas phase continuous catalytic hydrogenation of phenylacetylene. RESULTS Temperature programme reduction (TPR) generated metal particles at the nano‐scale (mean size = 3.0–4.3 nm), with evidence of electron donation from the aluminium oxide (Al2O3) carrier. Pd/Al2O3 exhibited a greater specific hydrogen (H2) uptake capacity than Au/Al2O3 under reaction conditions to deliver appreciably higher turnover frequencies (TOF) for reaction in excess H2. Stepwise hydrogenation predominated over Au/Al2O3 with 100% selectivity to styrene at 353 K where an increase in temperature favoured subsequent hydrogenation to ethylbenzene. Under the same conditions, Pd/Al2O3 was non‐selective, activating styrene to generate ethylbenzene with a greater contribution of direct phenylacetylene hydrogenation to ethylbenzene at higher temperature. CONCLUSION Kinetic analysis has revealed stepwise phenylacetylene hydrogenation in excess H2 over Au/Al2O3 with 100% selectivity to styrene. Stepwise hydrogenation also prevailed over Pd/Al2O3 at the lower temperature but surface activation of styrene coupled with enhanced H2 dissociation generated significant ethylbenzene. Decreasing inlet H2/phenylacetylene (to 1 mol/mol) over Pd/Al2O3 lowered rate where the activity/selectivity profile overlapped that exhibited by Au/Al2O3 in excess H2. © 2019 Society of Chemical Industry

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Section: Resultssupporting

confidence: 90%

Gas phase selective hydrogenation of phenylacetylene to styrene over Au/Al₂O₃

Wang

Keane

2019

J of Chemical Tech & Biotech

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“…The Pd 3d 5/2 peak for single-component Pd catalysts after the first catalytic test is located at 335.8 eV. This value is slightly higher than that for a bulk metallic Pd and it could be related to the very small Pd particles interacting strongly with the support and Tsud et al [30] explained the shift of the binding energy to the higher value with electron transfer from c-Al 2 O 3 to Pd metallic particles. The XPS data for all studied samples, obtained after ''depletive'' oxidation are also displayed in Table 2.…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 94%

On the development of active and stable Pd–Co/γ-Al2O3 catalyst for complete oxidation of methane

Stefanov

Todorova

Naydenov

et al. 2015

Chemical Engineering Journal

105

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“…Furthermore, a thermal treatment under hydrogen is accompanied by a shift of the photopeak at 335.1 eV which is assigned to the formation of metallic Pd particles dispersed on the surface of the support [20]. Increasing the temperature under reaction conditions between 473 K and 573 K (spectra e¢-f¢) leads to the attenuation of the signal at 335.2 eV and to the development of a contribution at 336.2 eV which has been assigned to Pd 2+ .…”

Section: Xps Characterisationsmentioning

confidence: 97%

Structural regeneration of LaCoO3 perovskite-based catalysts during the NO + H2 + O2 reactions

et al. 2007

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In situ X-ray diffraction (XRD) analysis was used to investigate structural evolutions of LaCoO 3 catalysts and then further modified by palladium (Pd) addition, under various controlled atmospheres, particularly during the reduction of NO by hydrogen in lean conditions. Complementary, XPS measurements provided information about changes in the chemical environments of Pd, Co and nitrogen during sequential temperature-programmed reactions. A preactivation thermal treatment under hydrogen led to the destruction of the perovskite structure while in the course of the NO+H 2 +O 2 reactions, the regeneration of the perovskite structure evidenced by XRD at 873 K started at lower temperature (573 K) at the surface. Palladium has been incorporated in order to evidence its effective role in the surface modifications of LaCoO 3 and its consequence on the catalytic activity.

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CO adsorption on palladium model catalysts: XPS Pd–Al2O3 interaction study

Cited by 46 publications

References 20 publications

Gas phase selective hydrogenation of phenylacetylene to styrene over Au/Al₂O₃

Gas phase selective hydrogenation of phenylacetylene to styrene over Au/Al₂O₃

On the development of active and stable Pd–Co/γ-Al2O3 catalyst for complete oxidation of methane

Structural regeneration of LaCoO3 perovskite-based catalysts during the NO + H2 + O2 reactions

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CO adsorption on palladium model catalysts: XPS Pd–Al2O3 interaction study

Cited by 46 publications

References 20 publications

Gas phase selective hydrogenation of phenylacetylene to styrene over Au/Al2O3

Gas phase selective hydrogenation of phenylacetylene to styrene over Au/Al2O3

On the development of active and stable Pd–Co/γ-Al2O3 catalyst for complete oxidation of methane

Structural regeneration of LaCoO3 perovskite-based catalysts during the NO + H2 + O2 reactions

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Gas phase selective hydrogenation of phenylacetylene to styrene over Au/Al₂O₃

Gas phase selective hydrogenation of phenylacetylene to styrene over Au/Al₂O₃