Surface characterisation of nickel boride and nickel phosphide catalysts by X-ray photoelectron spectroscopy

Okamoto, Yasuaki; Nitta, Yuriko; Imanaka, Toshinobu; Teranishi, Shiichirō

doi:10.1039/f19797502027

Cited by 209 publications

(195 citation statements)

References 2 publications

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“…White line peak appears only in the near edge of Ni 74 P 26 sample, indicating that the charge transfer from Ni atoms to P atoms occurs when the P concentration is above 25 at.% and for the low-P samples the charge transfers from P atoms to Ni atoms. This accords with XPS results [10,11].…”

Section: Resultssupporting

confidence: 82%

“…Such a large disorder confirms that the Ni-P alloys with high P concentration are totally amorphous. The coordination number of Ni-P coordination also increases from 1.8 to 3.0 following the increasing of P concentration form 14 to 26 at.%, different from the small value of Ni 92 P 8 and Ni 90 P 10 . At the same time, the coordination number of Ni-Ni decreases from 10.1 to 9.5 on the contrary.…”

Section: Resultsmentioning

confidence: 93%

“…Alloying P can modify the catalyst structure, which results in the short range ordering and long range disordering structural characteristics [9]. XPS results show that as the P concentration is lower than 25at.%, charge transfers from P atoms to Ni atoms; and for P concentration higher than 25at.%, charge transfers from Ni atoms to P atoms [10,11]. As the content of P increases, the catalytic activity of Ni-P first increases then decreases, and reaches the maximum when P at.% is about 8～11 wt.% (14 ～ 19at.%) [12].…”

Section: Introductionmentioning

confidence: 96%

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Effect of Phosphorus Content on Local Structures of NiP Amorphous Alloys

Song¹,

Zheng²,

Zhang³

et al. 2007

AIP Conference Proceedings

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Abstract. XAFS technique is used to determine the atomic and electronic structures of NiP amorphous alloys with different P concentrations prepared by chemical reduction method. From the radial structural function (RSF) obtained from EXAFS, it is found that the amorphous alloys with P content less than 10 at.% still present strong peaks corresponding to high coordination shells just like crystalline Ni. This indicates the prominent existence of Ni-rich phase with the fcc-structure, which is not remarkably modified by the P atoms. As the P content is as large as 14 at.%, only the first shell peak in the RSF can be observed and the higher shell peaks disappear. Therefore the sample is totally amorphous. The XANES results show that as the P concentration is above 26 at.%, charge transfers from Ni atoms to P atoms. For P concentration lower than 20at.%, on the contrary, charge transfers from P atoms to Ni atoms, and 3d electron density of Ni atoms reaches the maximum when P concentration is about 14~20 at.%.

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Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 96%

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Effect of Phosphorus Content on Local Structures of NiP Amorphous Alloys

Song¹,

Zheng²,

Zhang³

et al. 2007

AIP Conference Proceedings

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“…Though Ni was the active component, the activity for the hydrogenation of sulfolene increased with metalloid content increases for the same Ni-metalloid amorphous alloy. This is in accordance with the studies of Okamoto et al [24] There exists an obvious correlation between the particle size and the catalytic activity of these samples. With the particle size decreasing (NiB-2 < NiB-1∼NiBP-2 < NiP-2 < NiP-1), the catalytic activity of the samples increased (NiB-2 > NiBP-2∼NiB-1 > NiP-2 > NiP-1).…”

Section: Activity Of Nib Nip and Nibp Amorphous Catalystssupporting

confidence: 81%

“…The first viewpoint attributed the differences to the differences of the electron densities on the nickel metal among NiP, NiB and NiBP catalysts [17,24,25]. In NiB powder, boron donates electrons to the nickel metal, whereas phosphorus accept electrons from nickel metal in NiP powder.…”

Section: Activity Of Nib Nip and Nibp Amorphous Catalystsmentioning

confidence: 99%

Preparation and catalytic properties of amorphous alloys in hydrogenation of sulfolene

Zhang

et al. 2003

Applied Catalysis A: General

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Catalytic properties of Ni-B and Ni-P ultrafine materials

Lee

Chen

2000

J. Chem. Technol. Biotechnol.

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The ultra®ne Ni±B and Ni±P amorphous alloy catalysts were prepared by the chemical reduction method. The catalysts were characterized with respect to ICP-AES, XRD, nitrogen sorption, DSC, SEM, TEM and XPS. Nitrobenzene hydrogenation was used to compare their hydrogenation abilities. The different metalloids of boron and phosphorus bound to the nickel metal for the Ni±B and Ni±P catalysts result in the distinct different surface area, amorphous structure and hydrogenation activity of the catalysts. Ni±B had a larger surface area than Ni±P. The speci®c activity per surface area of Ni±P was greater than that of Ni±B. The different activities between the Ni±P and Ni±B can be attributed to the difference of the electron density on the nickel metal; boron donates electrons to the nickel metal and phosphorus accepts electrons from the nickel metal. The catalysts were easier to oxidize when they were exposed to air. This would result in the lower activity. However, the activity could be recovered in the reaction process due to the presence of hydrogen in the reaction system.

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Surface characterisation of nickel boride and nickel phosphide catalysts by X-ray photoelectron spectroscopy

Cited by 209 publications

References 2 publications

Effect of Phosphorus Content on Local Structures of NiP Amorphous Alloys

Effect of Phosphorus Content on Local Structures of NiP Amorphous Alloys

Preparation and catalytic properties of amorphous alloys in hydrogenation of sulfolene

Catalytic properties of Ni-B and Ni-P ultrafine materials

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