Structured bimetallic Pd-Pt/γ-Al2O3 catalysts on FeCrAlloy fibers for total combustion of methane

Maione, A.; André, Floriane; Ruíz, Patricio

doi:10.1016/j.apcatb.2007.03.011

Cited by 32 publications

(26 citation statements)

References 36 publications

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“…Unfortunately, neither palladium nor palladium oxide was detected in all of the samples. This is in agreement with the results found by Lapisardi et al [42] and Maione et al [43], in the case of Pd-based catalysts characterized by a Pd loading lower than 2%. Nevertheless, XRD analysis provided valuable information about the nature of different phases present in the catalysts.…”

Section: Characterization Of Catalystsupporting

confidence: 83%

Enhanced hydrothermal stability of high performance lean fuel combustion alumina-supported palladium catalyst modified by nickel

Liu

Wang

Sun

et al. 2012

Applied Catalysis B: Environmental

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Section: Characterization Of Catalystsupporting

confidence: 83%

Enhanced hydrothermal stability of high performance lean fuel combustion alumina-supported palladium catalyst modified by nickel

Liu

Wang

Sun

et al. 2012

Applied Catalysis B: Environmental

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“…This would reconcile our thermodynamic prediction with the observation of mixed particles composed of PdO and metal alloys in the catalysts. 3,2,5 Moreover, our results suggest that simultaneous stability of PdO and metallic Pt may be possible under Pd-rich conditions.…”

Section: Discussionmentioning

confidence: 86%

DFT Study of the Thermodynamic Stability of Pd−Pt Bulk Oxide Phases

Dianat¹,

Seriani²,

Bobeth³

et al. 2008

J. Phys. Chem. C

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The catalytic combustion activity of PdPt bimetallic catalysts is governed by oxide phases which form under oxygen-rich operation conditions. We investigate the thermodynamic stability of mixed Pd x Pt 1-x O y phases with the crystal structures of PdO, PtO 2 , and Pt 3 O 4 within an ab initio thermodynamics framework based on density-functional theory calculations. Our results suggest a complex mixing-demixing behavior of the Pd-Pt-O system upon variations of temperature and oxygen partial pressure. At atmospheric pressure mixed oxides are predicted to be stable only at temperatures below 400-500 K, whereby the presence of Pd 4+ ions is stabilized with increasing Pt amount in a Pd x Pt 1-x O 2 phase. At intermediate temperatures a mixture of phases becomes stable where PdO coexists with PtO 2 or Pt 3 O 4 . At high temperatures the oxides decompose directly to form PdPt alloys, except for Pd-rich systems, where PdO and metallic Pt coexist within a small temperature window.

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“…The present investigation also confirms that the Pd 2+ and Ag + can be reduced by the argon glow discharge plasma, according to the XPS analyses. Because the active palladium species for methane combustion is PdO [2][3][4][5][6][7][8][9][10][11], the plasma reduced catalysts were calcined to generate the PdO species. Figure 1 shows the XRD patterns of the C-Pd-M/HZSM-5 catalysts.…”

Section: Characterization Of the Plasma Treated Samplesmentioning

confidence: 99%

“…However, the supported Pd catalysts normally have a poor stability. To improve the stability of the supported Pd catalysts, a second metal or a co-metal was added, forming a bimetallic catalyst [8][9][10]. For example, Narui et al [8] reported that the addition of Pt to the PdO/Al 2 O 3 catalyst was effective in preventing the catalyst deactivation in methane combustion.…”

Section: Introductionmentioning

confidence: 98%

Enhanced Activity of Bimetallic Pd-Based Catalysts for Methane Combustion

Xie

Liu

2008

Catal Lett

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In this work, the bimetallic Pd catalysts containing Ag, Cu, Co and Ni were prepared via the glow discharge plasma treatment followed by calcination thermally. The X-ray photoelectron spectroscopy (XPS) analysis confirms that the plasma treatment can reduce Pd 2+ effectively. The calcination of the plasma formed Pd clusters enhances the formation of PdO that was identified as the active species for methane combustion. Compared to the conventional catalysts, all the plasma prepared samples show an enhancement in the activity at the same temperature. Among the investigated catalysts, the Pd-Ag/HZSM-5 sample exhibits the best activity for methane combustion.

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Structured bimetallic Pd-Pt/γ-Al2O3 catalysts on FeCrAlloy fibers for total combustion of methane

Cited by 32 publications

References 36 publications

Enhanced hydrothermal stability of high performance lean fuel combustion alumina-supported palladium catalyst modified by nickel

Enhanced hydrothermal stability of high performance lean fuel combustion alumina-supported palladium catalyst modified by nickel

DFT Study of the Thermodynamic Stability of Pd−Pt Bulk Oxide Phases

Enhanced Activity of Bimetallic Pd-Based Catalysts for Methane Combustion

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