Intermetallic phases in the magnesium-palladium system: x-ray absorption spectroscopic characterization of the amorphous magnesium-palladium-carbon-hydrogen alloy MgPdCxHy

Jones, Deborah J.; Rozière, Jacqués; Aleandri, Lorraine E.; Bogdanović, B.; Huckett, Sara C.

doi:10.1021/cm00021a023

Cited by 14 publications

(15 citation statements)

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“…Phys., 2012, 14, 5761-5768 5763 of a palladium carbide phase. 14,26 Fig. 1(b) and (c) show the corresponding chi-functions and Fourier transforms.…”

Section: Resultsmentioning

confidence: 99%

“…It was concluded that the absorption spectrum and the EXAFS Fourier transform of PdC 0.15 closely resemble those of metallic palladium and that the carbon has only a very minor contribution to the overall EXAFS. 26 A lattice expansion of around 2.7% occurs. Similar results were observed for a reduced 5% Pd/C catalyst after exposure to 1% C 2 H 4 /Ar at 150 1C.…”

Section: Introductionmentioning

confidence: 97%

“…23 Palladium carbide has been correlated to the loss of activity, stabilization of supported Pd catalysts, and high selectivity to alkene formation. Because the palladium carbide strongly affects the activity and selectivity, it has been characterized by using different techniques, including X-ray photoelectron spectroscopy (XPS), 24 X-ray diffraction (XRD), 25 and X-ray absorption spectroscopy (XAS) at the Pd K 13,14,26 and L 3 edges. 27 The structure of PdC 0.15 powder was determined ex situ by EXAFS at the Pd K edge.…”

Section: Introductionmentioning

confidence: 99%

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The irreversible formation of palladium carbide during hydrogenation of 1-pentyne over silica-supported palladium nanoparticles: in situ Pd K and L3 edge XAS

Tew

Nachtegaal

Janousch

et al. 2012

Phys. Chem. Chem. Phys.

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The catalytically active phase of silica-supported palladium catalysts in the selective and non-selective hydrogenation of 1-pentyne was determined using in situ X-ray absorption spectroscopy at the Pd K and L(3) edges. Upon exposure to alkyne, a palladium carbide-like phase rapidly forms, which prevents hydrogen to diffuse into the bulk of the nano-sized particles. Both selective and non-selective hydrogenation occur over carbided particles. The palladium carbide-like phase is stable under reaction conditions and only partially decomposes under high hydrogen partial pressure. Non-selective hydrogenation to pentane is not indicative of hydride formation. The palladium carbide phase was detected in the EXAFS analysis and the K edge XANES showed representative features.

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“…Phys., 2012, 14, 5761-5768 5763 of a palladium carbide phase. 14,26 Fig. 1(b) and (c) show the corresponding chi-functions and Fourier transforms.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The irreversible formation of palladium carbide during hydrogenation of 1-pentyne over silica-supported palladium nanoparticles: in situ Pd K and L3 edge XAS

Tew

Nachtegaal

Janousch

et al. 2012

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…Chenov et al [19] reported Pd-C shells at r = 2.3 and 3.3Å in the PdC 60 prepared from an organometallic precursor. Jones et al [15] reported Pd-C shells at r = 1.95 and 3.46Å in PdC 0.15 powders but McCaully [16,17] did not observe such a Pd-C coordination in his PdC 0.13 . Table 1 and Fig.…”

Section: Resultsmentioning

confidence: 98%

“…This is because that EXAFS generates only volume-average information. EXAFS has been used to study stable PdC x phase [15][16][17], Pd(NH 3 ) 4 Cl 2 /C [1], PdCl 2 /C [18] and Pd/fullerene [19]. Among these studies, bonding models of Pd-C interaction were proposed only for Pd(NH 3 ) 4 Cl 2 /C [1] and Pd/fullerene [19].…”

Section: Introductionmentioning

confidence: 99%