Abstract
Nickel borides doped with transition metal (Cr, Mn, Fe, Co, Cu, and Zn) MNiB, 4% w/w respect to Ni were prepared by chemical reduction of nickel and metallic salts in methanol solution with borane-tetrahydrofurane (BH3-THF) complex obtained in aprotic solvent (THF anhydrous). Different techniques were used to characterize these materials. The MNiB amorphous structure was verified by XRD. Thermal treatment in N2 shows Ni°, Ni2 Band NiO phases. Spongy-morphology was evident by SEM studies in all cases. XPS and TEM show that doped and non-doped nickel boride was present as Ni° in metallic state as principal phase and nickel alloying with boron was observed in minor quantities. The oxidation stability, magnetic susceptibility and catalytic effect are correlated with parameters of each dopant metal.
Highlights
It has been known for a long time that it is possible to precipitate black amorphous solids from solutions con-How to cite this paper: Acosta, D., Gonzo, E.E. and Destéfanis, H.A. (2016) Borane-Tetrahydrofurane Complex Reduction of Nickel and First Transition Metals in Tetrahydrofurane Media: Controllable Chemistry Leading to Nanoscale Metal and Metal Boride Particles
On the other hand in previous reports [5], nickel borides doped with first transition metal proved active catalysts in hydrogenation reactions like Glucose and Nitrobenzene hydrogenations according to the electrical nature of the metal dopant
Results from whole characterization techniques show in all cases that a nickel metal phase is modified by dopant metal
Summary
How to cite this paper: Acosta, D., Gonzo, E.E. and Destéfanis, H.A. (2016) Borane-Tetrahydrofurane Complex Reduction of Nickel and First Transition Metals in Tetrahydrofurane Media: Controllable Chemistry Leading to Nanoscale Metal and Metal Boride Particles. The literature is replete with various recipes for powder preparation given rise to products of varying nature and composition. These precipitates are considered to exhibit catalytic activity in all kinds of reduction reactions [2]. Their composition remained unclear for 40 years, their annealing behavior was investigated and found to lead to crystalline Ni2B [3] or Ni3B and elemental nickel (Ni) at temperatures near 773 K. On the other hand in previous reports [5], nickel borides doped with first transition metal proved active catalysts in hydrogenation reactions like Glucose and Nitrobenzene hydrogenations according to the electrical nature of the metal dopant. The incorporation of the dopant metals in minor proportions species shows that the obtained boride is unchanged in morphology and composition
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