XPS studies on surface electronic characteristics of Ni–B and Ni–P amorphous alloy and its correlation to their catalytic properties

Li, Hui; Li, Hexing; Dai, Wei‐Lin; Wang, Weijiang; Fang, Zhigang Zak; Deng, Jing‐Fa

doi:10.1016/s0169-4332(99)00294-9

Cited by 334 publications

(131 citation statements)

References 24 publications

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“…In the Co 2p3/2 region, only metallic Co at a BE of 778.4 eV appeared. In comparison with the standard BE values of pure metallic Co and amorphous boron powder, 18 the BE of the alloying B shifted positively about 1.3 eV. This implied that some electrons transferred from the alloying B to metallic Co, making Co electron-rich.…”

Section: Unpromoted Co-b Amorphous Catalystmentioning

confidence: 88%

“…The failure to observe the BE shift of metallic Co in the Co±B alloy was possibly due to the large size of the Co atom in comparison with that of B, which was similar to that observed in the Ni±B amorphous alloy. 18 Other characters of the as-prepared catalysts, the bulk composition, the BET surface area and number of surface active sites, are listed in Table 1. Additionally, the activities for the hydrogenation of glucose over the as-prepared catalysts are also given in Table 1.…”

Section: Unpromoted Co-b Amorphous Catalystmentioning

confidence: 99%

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Glucose hydrogenation on Co–B amorphous alloy catalysts and the promoting effect of metal additives

Deng

2001

J of Chemical Tech & Biotech

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Two kinds of ultra®ne Co±B amorphous alloy catalysts, denoted as P-1 Co±B and P-2W Co± B, were prepared by chemical reduction with borohydride in aqueous or 50% (v/v) ethanol/water solution, respectively. In comparison with the corresponding Co-based crystalline catalysts and Nibased catalysts, these catalysts exhibited higher activity during the liquid phase glucose hydrogenation, possibly due to the unique amorphous characteristics and the lower d-band electron density, which was favorable for hydrogen dissociative chemisorption. Addition of Cr-, Mo-or W-promoters could further increase the conversion of Co±B amorphous catalyst, which was mainly attributed to the dispersion effect of promoters and the adsorption and polarization of carbonyl groups by these promoters. The different effects of W-from Cr-and Mo-promoters on the conversion were observed and are discussed.

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Section: Unpromoted Co-b Amorphous Catalystmentioning

confidence: 88%

Section: Unpromoted Co-b Amorphous Catalystmentioning

confidence: 99%

Glucose hydrogenation on Co–B amorphous alloy catalysts and the promoting effect of metal additives

Deng

2001

J of Chemical Tech & Biotech

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“…The differences of electron densities on the nickel metal results in the markedly different hydrogenation activity of these catalysts. The second viewpoint attributed the differences to the difference of the particle sizes or active site numbers [26,27]. Both factors can affect the catalytic performance of the amorphous alloys, but in different cases the dominant one is different.…”

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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“…Compared to nano-amorphous Ni-B alloys, Ni-P alloys have higher selectivity and turnover of frequencies (TOF) despite smaller surface area [1,6], showing the potential to represent a new generation of hydrogenation catalysts. Preparing Ni-P alloys by chemical reduction method has the advantages of low cost and simple technology to be suitably applied in industry.…”

Section: Introductionmentioning

confidence: 99%

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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XPS studies on surface electronic characteristics of Ni–B and Ni–P amorphous alloy and its correlation to their catalytic properties

Cited by 334 publications

References 24 publications

Glucose hydrogenation on Co–B amorphous alloy catalysts and the promoting effect of metal additives

Glucose hydrogenation on Co–B amorphous alloy catalysts and the promoting effect of metal additives

Preparation and catalytic properties of amorphous alloys in hydrogenation of sulfolene

Effect of Phosphorus Content on Local Structures of NiP Amorphous Alloys

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