The Study of Ultrafine Ni-B and Ni-P Amorphous Alloy Powders as Catalysts

Exploring the Structural Complexities of Metal–Metalloid Nanoparticles: The Case of Ni⋅B as Catalyst

“…As expected, the raw material shows a complete absence of any sharp diffraction peaks, and only a broad diffraction at around 2q = 458 (Figure 3a), consistent with the literature reports. [13,[26][27][28] Moreover, in previous studies this broad peak has been assigned to amorphous nickel. Here, our HRTEM observation of the ultrafine crystalline structure clearly indicates that although the component nanoparticles are extremely small, they are nevertheless crystalline.…”

“…It was originally thought that this material was a simple stoichiometric nickel boride compound, with a formula of Ni 2 B or Ni 3 B, but the boron content was later found to vary with the ratio of the reactants used in preparation. [7][8][9][10][11][12][13][14][15][16][17][18] Studies on the structure using powder X-ray diffraction (XRD), [13,[26][27][28] X-ray photoelectron spectroscopy (XPS), [12,14,29,30] and transmission electron microscopy (TEM) [15,27,28,30] led to a view that the material is amorphous, and as a consequence, it is frequently referred to as an "amorphous nickel boron alloy".…”

Amorphous Ni–B/SiO2 catalyst prepared by microwave heating and its catalytic activityin acrylonitrile hydrogenation

“…Actually, mechanistic study reveals that boron oxide is inevitably formed for the reduction reaction carried out in aqueous solution due to the hydrolysis of borohydride. 26 The XPS features of Ni-B/SiO 2 (MW-H5) are identical to those of Ni-B/SiO 2 (CH) (not shown) and the ultrafine Ni-B alloy, 24 demonstrating that the microwave field does not influence the electronic structure of the reduced catalyst and there is no discernable electronic interaction between the support and the Ni-B alloy. Correlation of activity of the microwave-heated Ni-B/SiO 2 catalysts with their structures The active surface area, H 2 uptake rate (R H ), and TOF of acrylonitrile over Ni-B/SiO 2 (CH) and microwaveheated Ni-B/SiO 2 (MW) catalysts are listed in Table 2.…”

“…A previous study 24 using an ultrafine amorphous Ni-B alloy with a similar composition showed that crystallization takes place at atleast 120 K lower than that of the supported one, which is due to the stabilizing effect of the support. The stabilizing effect can be understood by considering the following aspects: (1) The dispersion of the amorphous alloy on the support.…”

A novel synthesis route for ethylenediamine-protected ruthenium nanoparticles

“…5. The two broad peaks around 2θ = 37 • and 58 • correlate with the presence of RuO 2 [23][24][25][26] and amorphous ruthenium nanoparticles, respectively [27][28][29][30]. The diffused electron diffraction pattern in Fig.…”