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.
Original language | English |
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Pages (from-to) | 184-190 |
Number of pages | 7 |
Journal | Applied Catalysis A: General |
Volume | 316 |
Issue number | 2 |
DOIs | |
Publication status | Published - Jan 10 2007 |
Keywords
- Brønsted acidity
- Infrared spectroscopy
- Propanol dehydration
- Raman spectroscopy
- Surface analysis
- Titania-supported niobium oxide
ASJC Scopus subject areas
- Catalysis
- Process Chemistry and Technology