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X-ray absorption near edge structure and X-ray photo electron spectroscopy analyses of NiMo/Al2O3 catalysts containing boron and phosphorus

“…SO 4 2− can also be formed because of the minor oxidation of S 2− in presence of air during sample preparation [21]. Similar results were also observed by Rodriguez et al [15] and Chaturvedi et al [24] for the sulfided ␣-NiMoO 4 and sulfided ␤-NiMoO 4 catalyst.…”

Amorphous Ni–Fe–Mo Suboxides Coupled with Ni Network as Porous Nanoplate Array on Nickel Foam: A Highly Efficient and Durable Bifunctional Electrode for Overall Water Splitting

“…The elemental line profiles show that Mo, Fe, and O element exist in the second component, and Ni element is overlapped with them where no Ni particles contacted (Figure 1h; Figure S19, Supporting Information), suggesting Ni element is also present in this component. The line shape of the O K‐edge X‐ray absorption near edge structure (XANES) of Ni/NiFeMoO x /NF is like that of MoO 3 , but quite different from that of NiO and Fe 2 O 3 (Figure 2d), indicating that the second component should be an oxide with a structure similar with MoO 3 . The Mo(0) signal is not detected by XPS (Figure 2b), and the adsorption edge in the Mo K‐edge XANES of Ni/NiFeMoO x /NF locates between MoO 2 and MoO 3 (Figure 2e), proving Mo exists in an ionic state with average valence between +6 and +4.…”

Structural, Optical, and Magnetic Properties of NiMoO4Nanorods Prepared by Microwave Sintering

“…Both α -NiMoO 4 and β -NiMoO 4 are often obtained by heating their nickel molybdate hydrates NiMoO 4 : n H 2 O that is utilized as a precursor [11]. On the other hand, the synthesis of the pure β -NiMoO 4 phase is usually generated by heating the α -NiMoO 4 at temperature above 760°C; however, the β -NiMoO 4 phase is stable only above 180°C due that on cooling below at this temperature transforms again into the α -NiMoO 4 phase, which is more stable under these conditions [12–15]. These studies have examined the catalytic properties of both phases and in all these cases the β -NiMoO 4 phase showed a higher efficiency in these tests.…”