Novel embedded Pd@CeO<sub>2</sub>catalysts: a way to active and stable catalysts

Cargnello, Matteo; Montini, Tiziano; Polizzi, Stefano; Wieder, Noah L.; Gorte, Raymond J.; Graziani, M.; Fornasiero, Paolo

doi:10.1039/b916035c

Cited by 81 publications

(69 citation statements)

References 32 publications

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“…[11][12][13][14][15][16][17][18][19] In the present paper, we demonstrate that the synthetic method used to prepare Pd@CeO 2 core-shell nanostructures can be modified to produce particles with Pt or Pd cores and with TiO 2 , ZrO 2 , or CeO 2 shells. [11][12][13][14][15][16][17][18][19] In the present paper, we demonstrate that the synthetic method used to prepare Pd@CeO 2 core-shell nanostructures can be modified to produce particles with Pt or Pd cores and with TiO 2 , ZrO 2 , or CeO 2 shells.…”

Section: Introductionmentioning

confidence: 61%

A Versatile Route to Core–Shell Catalysts: Synthesis of Dispersible M@Oxide (M=Pd, Pt; Oxide=TiO₂, ZrO₂) Nanostructures by Self‐Assembly

et al. 2012

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A method, based on self assembly, for preparing core-shell nanostructures that are dispersible in organic solvents is demonstrated for Pd and Pt cores with CeO(2), TiO(2), and ZrO(2) shells. Transmission electron microscopy (TEM) of these nanostructures confirmed the formation of distinct metal cores, approximately 2 nm in diameter, surrounded by amorphous oxide shells. Functional catalysts were prepared by dispersing the nanostructures onto an Al(2)O(3) support; and vibrational spectra of adsorbed CO, together with adsorption uptakes, were used to demonstrate the accessibility of the metal core to CO and the porous nature of the oxide shell. Measurements of water-gas-shift (WGS) rates demonstrated that these catalysts exhibit activities similar to that of conventional supported catalysts despite having lower metal dispersions. Pd-based CeO(2) and TiO(2) core-shell catalysts exhibit significant transient deactivation, which is probably caused by a decrease in the exposed metal surface area due to the ease of reduction of the shells. Alternatively, Pt-based analogous core-shell catalysts do not exhibit such a transient decrease. Both Pd- and Pt-based ZrO(2) core-shell catalysts deactivate at a significantly lower rate due to the less reducible nature of the ZrO(2) shell.

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Section: Introductionmentioning

confidence: 61%

A Versatile Route to Core–Shell Catalysts: Synthesis of Dispersible M@Oxide (M=Pd, Pt; Oxide=TiO₂, ZrO₂) Nanostructures by Self‐Assembly

et al. 2012

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“…Presently, Pd/CeO 2 catalysts are commonly synthesized using chemical techniques that include impregnation 24,[40][41][42] , precipitation 4,20,23,36,43 , the sol-gel method 28 , microemulsion method 13,44 and solution combustion 8,22,29 . Presently, Pd/CeO 2 catalysts are commonly synthesized using chemical techniques that include impregnation 24,[40][41][42] , precipitation 4,20,23,36,43 , the sol-gel method 28 , microemulsion method 13,44 and solution combustion 8,22,29 .…”

Section: Introductionmentioning

confidence: 99%

Metal–support interaction in Pd/CeO₂ model catalysts for CO oxidation: from pulsed laser-ablated nanoparticles to highly active state of the catalyst

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et al. 2016

Catal. Sci. Technol.

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Palladium and cerium oxide nanoparticles obtained by pulsed laser ablation (PLA) in liquid (water or ethanol) have been used as nanostructured precursors for synthesis of the composite Pd/CeO2 catalysts. The initial mixture of Pd and CeO2 nanoparticles does not show catalytic activity at temperatures lower than 100°C. It has been found that the composites prepared by PLA in alcohol are easily activated by calcination in air at 450-600°C demonstrating high activity at room temperature. Application of XRD, TEM and XPS reveals that laser ablation in water leads to the formation of large and well crystallized nanoparticles of palladium and CeO2, whereas ablation in alcohol results in formation of much smaller PdCx nanoparticles. The activation of the composites takes place due to the strong Pd-ceria interaction which occurs easier for highly-dispersed defective particles obtained in alcohol. Such interaction implies the introduction of palladium ions into the ceria lattice with formation of a mixed phase of PdxCe1-xO2-x-δ solid solution at the contact spaces of palladium and cerium oxide nanoparticles. The TPR-CO and XPS data show clearly that on the surface of the PdxCe1-xO2-x-δ solid solution the oxidized PdOx(s)/Pd-O-Ce(s) clusters are formed. These clusters comprise the highly reactive oxygen which is responsible for the high catalytic activity in LTO CO.Please do not adjust margins Please do not adjust margins CO (molecules/cm 3 ), X is the CO conversion, V RM is the reaction mixture rate (cm 3 /sec), m is the weight of the sample (g), and

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“…Pd‐ and Pt‐based metal‐oxide materials are, for example, used in gas sensing of CO and for CO removal in exhaust gas after treatment . Among these functionalized materials, core@shell nanostructures have gained a lot of attention for application as catalysts and sensors, as they offer the potential of exceptional stability and performance. SnO 2 hollow spheres with Pd placed inside were recently reported as a new sensor material for the detection of reducing gases (e.g., CO and H 2 ) with very good sensor performance above 250 °C .…”

Section: Figurementioning

confidence: 99%

Comparison of the Catalytic Performance and Carbon Monoxide Sensing Behavior of Pd‐SnO₂ Core@Shell Nanocomposites

et al. 2017

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The catalytic activity of Pd‐SnO2 core@shell nanocomposites in the oxidation of CO and their CO‐sensing behavior were compared. For this purpose, Pd particles were placed on the inside and the outside of SnO2 hollow spheres, as demonstrated by electron tomography, X‐ray photoelectron spectroscopy, and X‐ray absorption spectroscopy. Both the sensing and catalytic effect were studied in a systematic manner on such nanocomposites, and striking differences in the catalytic performance of the nanocomposites in CO oxidation and CO and H2 sensing were found. At low temperatures, SnO2@Pd was found to be a good sensor, and the light‐off temperature was significantly lower than that of Pd@SnO2. Above the ignition temperature, CO was probably rapidly removed from the gas so that the sensing effect disappeared. This demonstrated that understanding of the sensing and catalytic behavior can help in unraveling the functional properties of core@shell and Pd‐SnO2 nanocomposites in more detail.

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Novel embedded Pd@CeO₂catalysts: a way to active and stable catalysts

Cited by 81 publications

References 32 publications

A Versatile Route to Core–Shell Catalysts: Synthesis of Dispersible M@Oxide (M=Pd, Pt; Oxide=TiO₂, ZrO₂) Nanostructures by Self‐Assembly

A Versatile Route to Core–Shell Catalysts: Synthesis of Dispersible M@Oxide (M=Pd, Pt; Oxide=TiO₂, ZrO₂) Nanostructures by Self‐Assembly

Metal–support interaction in Pd/CeO₂ model catalysts for CO oxidation: from pulsed laser-ablated nanoparticles to highly active state of the catalyst

Comparison of the Catalytic Performance and Carbon Monoxide Sensing Behavior of Pd‐SnO₂ Core@Shell Nanocomposites

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Novel embedded Pd@CeO2catalysts: a way to active and stable catalysts

Cited by 81 publications

References 32 publications

A Versatile Route to Core–Shell Catalysts: Synthesis of Dispersible M@Oxide (M=Pd, Pt; Oxide=TiO2, ZrO2) Nanostructures by Self‐Assembly

A Versatile Route to Core–Shell Catalysts: Synthesis of Dispersible M@Oxide (M=Pd, Pt; Oxide=TiO2, ZrO2) Nanostructures by Self‐Assembly

Metal–support interaction in Pd/CeO2 model catalysts for CO oxidation: from pulsed laser-ablated nanoparticles to highly active state of the catalyst

Comparison of the Catalytic Performance and Carbon Monoxide Sensing Behavior of Pd‐SnO2 Core@Shell Nanocomposites

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Novel embedded Pd@CeO₂catalysts: a way to active and stable catalysts

A Versatile Route to Core–Shell Catalysts: Synthesis of Dispersible M@Oxide (M=Pd, Pt; Oxide=TiO₂, ZrO₂) Nanostructures by Self‐Assembly

A Versatile Route to Core–Shell Catalysts: Synthesis of Dispersible M@Oxide (M=Pd, Pt; Oxide=TiO₂, ZrO₂) Nanostructures by Self‐Assembly

Metal–support interaction in Pd/CeO₂ model catalysts for CO oxidation: from pulsed laser-ablated nanoparticles to highly active state of the catalyst

Comparison of the Catalytic Performance and Carbon Monoxide Sensing Behavior of Pd‐SnO₂ Core@Shell Nanocomposites