Surface characterization of amorphous Ni$z.sbnd;B films treated with oxygen

Tamaki, Jun; Takagaki, Hidetsugu; Imanaka, Toshinobu

doi:10.1016/0021-9517(87)90173-4

Cited by 21 publications

(5 citation statements)

References 6 publications

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“…Phosphorus oxide and boron oxide were produced during the preparation of the catalyst; Schreifels et al indicated the oxygen was from the soluble oxygen in the water solution. The same results have been reported by Chen et al ,,,, It was evidenced that all the XPS data of phosphorus for Ni−P−B and Ni−P catalysts and of boron for Ni−P−B and Ni−B catalysts demonstrated an element state (P, B) and an oxide state, even though the samples were reduced in situ.…”

Section: Resultssupporting

confidence: 87%

Selective Hydrogenation of Furfural on Ni−P, Ni−B, and Ni−P−B Ultrafine Materials

Lee

Chen

1999

Ind. Eng. Chem. Res.

109

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A series of ultafine Ni−P, Ni−B, and Ni−P−B amorphous alloy catalysts with various atomic ratios were prepared by a chemical reduction method. The catalysts were characterized with respect to elemental analysis, nitrogen sorption, XRD, TEM, XPS, and hydrogenation activity. Conventional Raney nickel was included for comparison. The Ni/P/B molar ratio in the starting material significantly affected the concentration of boron and phosphorus bonded to the nickel metal, subsequently affecting the surface area, the amorphous structure, and the hydrogenation activity and selectivity of the catalyst. The different electron transfer between nickel metal and the metalloid elements in Ni−P and Ni−B powders (phosphorus draws electrons and boron donates electrons) results in the extremely different hydrogenation activity of furfural (specific activity per surface area: Ni85.0P15.0 ≫ Ni71.4B28.9). By regulating a suitable P/B ratio, the ultrafine Ni−P−B catalyst dramatically revealed a markedly higher hydrogenation activity of furfural than Ni−P and Ni−B. The specific activities per surface area of the catalyst are in the order Ni74.5P12.1B13.4 > Ni72.5P2.0B25.5 > Ni85.0P15.0 ≫ Ni71.4B28.9 > Raney nickel. The phosphorus is an active component to improve the selectivity of furfuryl alcohol. The hydrogenation of furfural is catalyzed actively by the Ni−P x −B y catalysts, following the first order with respect to the concentration of furfural. The nature of the ultrafine amorphous structure and the P/B ratio are the keys to manipulate the catalytic properties of Ni−P x −B y amorphous alloy catalysts.

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Section: Resultssupporting

confidence: 87%

Selective Hydrogenation of Furfural on Ni−P, Ni−B, and Ni−P−B Ultrafine Materials

Lee

Chen

1999

Ind. Eng. Chem. Res.

109

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“…Owing to the lone electron pair on the oxygen atom, the electron-enriched Ni would repel O 2 , while the electron-deficient B would attract O 2 when the Ni−B sample contacted with O 2 , making Ni free from oxidation. As we know, the affinity of boron for oxygen is larger than that of nickel (Δ H f of B 2 O 3 and NiO are −302.0 and −58.4 kcal/mol, respectively) . Moreover, the theoretical calculations using the DFT method also confirmed that oxygen atoms would preferentially react with boron in the Ni 4 B 2 or Ni 8 B 2 cluster, leading to the oxidation of boron to form B 2 O 3 .…”

Section: Resultsmentioning

confidence: 99%

Evidence for the Antioxidation Effect of Boron on the Ultrafine Amorphous Ni−B Alloy Catalyst

Dai

Cao

et al. 2002

Langmuir

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“…Tamaki et al also observed that when amorphous NiB alloy prepared by a quenched method was exposed to oxygen, the boron was oxidized prior to the nickel. 17 With the suggestion proposed by many authors, we can easily explain the result obtained from the amorphous NiB/SiO 2 catalyst. The excellent air resistance of the amorphous NiB/SiO 2 catalyst could be explained based on the factor of B 0 adsorbing oxygen prior to metallic nickel (Ni 0 ).…”

Section: Discussionmentioning

confidence: 71%

High resistance to aerial oxidation of an amorphous NiB/SiO₂ catalyst: TP‐XRD, TPR and related investigations

Wang

et al. 2004

J of Chemical Tech & Biotech

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An amorphous NiB/SiO 2 catalyst, prepared by a reductive-impregnation method, was thoroughly studied as to its behavior in air and in benzene hydrogenation in a fixed-bed reactor at atmospheric pressure. The results showed that the amorphous NiB/SiO 2 catalyst possessed long life and excellent resistance to aerial oxidation. Even after calcination at 400• C, TP-XRD and TPR measurements revealed that the amorphous NiB/SiO 2 catalyst was not oxidized, and could retain its activity in benzene hydrogenation.

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Surface characterization of amorphous Ni$z.sbnd;B films treated with oxygen

Cited by 21 publications

References 6 publications

Selective Hydrogenation of Furfural on Ni−P, Ni−B, and Ni−P−B Ultrafine Materials

Selective Hydrogenation of Furfural on Ni−P, Ni−B, and Ni−P−B Ultrafine Materials

Evidence for the Antioxidation Effect of Boron on the Ultrafine Amorphous Ni−B Alloy Catalyst

High resistance to aerial oxidation of an amorphous NiB/SiO₂ catalyst: TP‐XRD, TPR and related investigations

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Surface characterization of amorphous Ni$z.sbnd;B films treated with oxygen

Cited by 21 publications

References 6 publications

Selective Hydrogenation of Furfural on Ni−P, Ni−B, and Ni−P−B Ultrafine Materials

Selective Hydrogenation of Furfural on Ni−P, Ni−B, and Ni−P−B Ultrafine Materials

Evidence for the Antioxidation Effect of Boron on the Ultrafine Amorphous Ni−B Alloy Catalyst

High resistance to aerial oxidation of an amorphous NiB/SiO2 catalyst: TP‐XRD, TPR and related investigations

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High resistance to aerial oxidation of an amorphous NiB/SiO₂ catalyst: TP‐XRD, TPR and related investigations