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• W2076288981 endingPage "2439" @default.
• W2076288981 startingPage "2432" @default.
• W2076288981 abstract "The sol–gel processing method was used as an alternative route to obtain Nb2O5 phase homogenously dispersed in the SiO2 matrix, improving the thermal stability of the Brønsted acid sites, Nb–OH and Nb–OH–Si groups. The local niobium structure and the influence of the amount of niobia on the surface of the Nb2O5/SiO2 system were studied by XAS and XPS, respectively. For the samples calcined at 423 and 873 K, the 3d5/2 BE values are at ca. 208.2 eV, indicating an ionic character for Nb(V) species in the SiO2 matrix, probably associated to Si–O–Nb linkages. The features of Nb K-edge XANES spectra of samples show the absence of NbO species. The Nb K-edge EXAFS oscillations exhibit a shoulder at ca. 5.6 Å−1, which probably arises from Nb–O–Si. This fact corroborates the EXAFS simulation data of the second coordination shell, whose best fitting is achieved with three distances, two Nb–Nb lengths and one Nb–Si." @default.
• W2076288981 created "2016-06-24" @default.
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• W2076288981 date "2004-07-01" @default.
• W2076288981 modified "2023-10-02" @default.
• W2076288981 title "Local order structure and surface acidity properties of a Nb2O5/SiO2 mixed oxide prepared by the sol–gel processing method" @default.
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• W2076288981 doi "https://doi.org/10.1016/j.jssc.2004.03.035" @default.
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