Showing papers on "Nickel boride published in 2013"
TL;DR: In this paper, it was shown that low temperature hydrogen treatment of nano nickel boride catalysts is an efficient process for the enhancement of their activity in the p-nitrophenol to p-aminophenol (PAP) hydrogenation reaction.
Abstract: It is shown that low temperature (<100 °C) hydrogen treatment of nano nickel boride catalysts is an efficient process for the enhancement of their activity in the p-nitrophenol (PNP) to p-aminophenol (PAP) hydrogenation reaction. It has been shown that such a process excludes initial borate species present on the surface and within the catalyst nano-particles by promoting their dissolution in the liquid phase. The latter phenomenon is enhanced by increasing the temperature. Treatment in the absence of hydrogen results in no reaction rate enhancement. Instead, the activity falls significantly below that of the as-synthesized catalyst. The effect of hydrogen treatment on the catalyst physical properties was investigated using FTIR, XRD, nitrogen adsorption and FESEM analysis. Mathematical simulation of the PNP hydrogenation reaction rate supports the hypothesis that the rate enhancement is mainly due to the increase of the catalyst specific surface area and partial reduction of surface nickel oxide species. The mechanism by which hydrogen increases the specific surface is discussed.
10 citations
Patent•
18 Apr 2013TL;DR: In this paper, the paste composition can contain a nickel intermetallic compound such as nickel silicide, nickel boride or nickel phosphide, a glass frit, a metal additive and an organic vehicle system.
Abstract: Paste compositions, methods of making a paste composition, and methods of making a solar cell contact are disclosed. The paste composition can contain a nickel intermetallic compound such as nickel silicide, nickel boride or nickel phosphide, a glass frit, a metal additive and an organic vehicle system. The paste can be used for making a solar cell contact.
9 citations
TL;DR: In this article, the α-Al2O3 supported catalyst exhibits a significantly lower catalytic activity for the hydrogenation of p-nitrophenol than the unsupported nickel boride nanoparticles.
Abstract: The morphology of supported nickel boride nanoparticles depends strongly on the exposed surface cation exchange property of the support. Despite having a substantially higher loading of nickel boride, the α-Al2O3 supported catalyst exhibits a significantly lower catalytic activity for the hydrogenation of p-nitrophenol. Use of a supporting material like clinoptilolite allows the re-use of the catalyst up to three times. However, the catalytic activity decreases after each hydrogenation process. Unsupported nickel boride and α-Al2O3 supported nickel boride result in unwanted trace impurities in the final p-aminophenol crystalline product. Such impurities are absent using clinoptilolite and kieselguhr supports.
2 citations
TL;DR: In this article, phase inversion of polymer solution by immersion-precipitation method was used to prepare porous hollow capsule nickel boride composite, in which sodium borohydride was absorbed into the capsules or embedded in the capsules during the processing of capsules formation.
Abstract: Phase inversion of polymer solution by immersion-precipitation method was used to prepare porous hollow capsule nickel boride composite. The composite was used as a carrier for sodium borohydride, in which sodium borohydride was absorbed into the capsules or embedded in the capsules during the processing of capsules formation. The preparation method and adsorption property of the polymer capsules were studied. The effect of capsules structure on the storage capacity of sodium borohydride was investigated. The results showed that capsules prepared by 18wt% of PVDF-DMF solution with adding 15% PVP had the best adsorption capacity. While capsules prepared by PVA had better affinity to water, this made them easier to absorb sodium borohydride in the aqueous solution.