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Surface structure and catalytic performance of niobium oxides supported on titania

Abstract : The surface structure and activity of catalytic systems based on niobium oxide supported on titania were investigated. A series of catalysts with Nb content up to 3.6 atoms/nm2 was prepared by incipient wetness impregnation of the titania support with niobium oxalate solutions. Characterization of the system by X-ray diffraction (XRD) and Raman spectroscopy studies did not show evidence of niobium oxide formation. Surface analysis was performed by X-ray photoelectron spectroscopy (XPS), ion scattering spectroscopy (ISS), Raman and infrared spectroscopy. These results were correlated with Brønsted acidity and catalytic activity determined in our previous study. A direct correlation between the catalytic activity and the abundance of Brønsted acid sites had been observed. Analysis of the surface structure by infrared spectroscopy showed a similar evolution for the intensity of the band attributed to polymerized NbOx.
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Contributor : Guillaume Clet Connect in order to contact the contributor
Submitted on : Friday, October 15, 2021 - 11:59:15 AM
Last modification on : Wednesday, December 15, 2021 - 9:58:49 AM

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Thomas Onfroy, Olga Manoilova, Saeed Bukallah, David Hercules, Guillaume Clet, et al.. Surface structure and catalytic performance of niobium oxides supported on titania. Applied Catalysis A : General, Elsevier, 2007, 316 (2), pp.184-190. ⟨10.1016/j.apcata.2006.09.021⟩. ⟨hal-03379965⟩

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