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Surface structure and catalytic performance of niobium oxides supported on titania

Paper ID Volume ID Publish Year Pages File Format Full-Text
43825 45990 2007 7 PDF Available
Title
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.

Graphical abstractThe surface structure and activity of catalytic systems based on niobium oxide supported on titania were characterized by XRD, XPS, Ion Scattering spectroscopy (ISS), Raman and infrared spectroscopy. The catalytic activity for propanol dehydration and the abundance of Brønsted acid sites were directly correlated and their development is consistent with that of the intensity of the infrared band attributed to polymerized NbOx. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Titania-supported niobium oxide; Brønsted acidity; Surface analysis; Infrared spectroscopy; Raman spectroscopy; Propanol dehydration
First Page Preview
Surface structure and catalytic performance of niobium oxides supported on titania
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 316, Issue 2, 10 January 2007, Pages 184–190
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis