Study of Ni–Ag/SiO2 catalysts prepared by reduction in aqueous hydrazine

The effect of SiO2 nanoparticles dispersion on physico-chemical properties of modified Ni–W nanocomposite coatings

“…1). This stable complex enhanced the electroplating of the mixed alloy to the detriment of Ni-SiO 2 as suggested elsewhere [29][30][31] when studying electroplating of nano SiO 2 in Ni matrix. On the other hand, peak referred to the copper species is absent for the both nanocomposite coatings EDS spectra.…”

“…This diffraction pattern indicated that both Ni-W/nano-SiO 2 films contain the f.c.c. Ni-like structure [19,31,32].…”

NiAg catalysts prepared by reduction of Ni2+ ions in aqueous hydrazine

“…Further, the presence of a second metal also influenced the morphology of the nickel particles in terms of size and indirectly its dispersion [15,16]. For NiAg catalysts, the most important feature of the results obtained is that silver, an inactive metal in hydrogenation reactions, led to an improvement in the reactivity of nickel [16]. Apart from the better dispersion observed, this can be explained based on the metal reduction mechanism in the hydrazine media.…”

“…It was shown that the morphology of the particles formed changed with reduction conditions and metal loading [14]. Further, the presence of a second metal also influenced the morphology of the nickel particles in terms of size and indirectly its dispersion [15,16]. For NiAg catalysts, the most important feature of the results obtained is that silver, an inactive metal in hydrogenation reactions, led to an improvement in the reactivity of nickel [16].…”

Enhanced chemoselective hydrogenation of dimethyl oxalate to methyl glycolate over bimetallic Ag–Ni/SBA-15 catalysts

“…The XRD patterns of Ag/SBA-15, Ni/SBA-15, and Ag-Ni/SBA-15 are presented in Only an extremely weak signal or no signal observed could confirm a high dispersion of nickel active phase or express low nickel content [31]. Given that the 2θ values of metallic Ag and Ni were almost the same at 2θ = 44° and 2θ = 77°, distinguishing among AgNi alloys phase based on XRD patterns is difficult.…”