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

Comparative studies on catalytic behaviors of various Co- and Ni-based catalysts during liquid phase acetonitrile hydrogenation

“…(c) The theoretical calculations using ab initio DFT method also demonstrated that the alloying B donated partial electrons to Ni in the M-B amorphous alloy regardless the model of M-B clusters (M x B 2 , x = 1-4), as shown in Table 1. (d) As reported in our previous paper [23], the alloying B in the Ni-B amorphous alloy could effectively protect the metallic Ni from oxidation. A reasonable explanation [26].…”

“…6 also demonstrated that the content of alloying B decreased while the amount of the oxidizing B increased during the heating treatment, possibly due to the surface oxidation of the alloying B by trace oxygen in N 2 flow at high temperature. However, no significant oxidation of either metallic Ni or metallic Co was observed during the heating treatment, showing that the presence of the alloying B could effectively protect the surface Co or Ni from oxidation [23]. In addition, the BE of the alloying B gradually shifted down to 187.2 eV during the heating treatment due to the decomposition of the M-B alloys, as confirmed by the aforementioned XRD patterns.…”

Ultrasound‐assisted Cinnamaldehyde Hydrogenation to Cinnamyl Alcohol at Atmospheric Pressure over Ru‐B Amorphous Catalyst

“…However, it can be seen that, unlike B species, the Ru species in the Ru-B alloy was present in the metallic state and no oxidation of the metallic Ru occurred even after irradiation for 6 h, which can be ascribed to the antioxidation effect of boron in the Ru-B amorphopus alloy. 28 The surface composition can be determined via analysis of the relative areas of the peaks corresponding to metallic Ru and alloyed B. By calculating the peak areas of elemental Ru and boron, the surface compositions of the fresh Ru-B and ultrasonicated Ru-B samples were determined as Ru 72.8 B 27.2 and Ru 95.9 B 4.1 , respectively.…”

Chapter 4. Preparation and catalytic applications of amorphous alloys

“…It has been suggested that the chemical reduction of Ni 21 ions by hypophosphite for Ni-P amorphous alloy should be performed at 363 K. 74,75 However, Ru-P amorphous alloy should be prepared by chemical reduction of ruthenium chloride with sodium hypophosphite at lower temperature, 323 K. 45 The as-synthesized Ru-P amorphous alloy was extremely active compared with the reference Ru-B amorphous alloy in the liquid-phase hydrogenation of maltose to maltitol (Scheme 7). One factor is the more highly unsaturated Ru active sites promoted by alloying with P, which could strengthen the adsorption of reactants and favor catalytic activity.…”