Surface structure and catalytic performance of niobium oxides supported on titania

Thomas Onfroy; Olga V. Manoilova; Saeed B. Bukallah; David M. Hercules; Guillaume Clet; Marwan Houalla

doi:10.1016/j.apcata.2006.09.021

Surface structure and catalytic performance of niobium oxides supported on titania

Thomas Onfroy, Olga V. Manoilova, Saeed B. Bukallah, David M. Hercules, Guillaume Clet, Marwan Houalla

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

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 NbO_x.

Original language	English
Pages (from-to)	184-190
Number of pages	7
Journal	Applied Catalysis A: General
Volume	316
Issue number	2
DOIs	https://doi.org/10.1016/j.apcata.2006.09.021
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

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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 Br{\o}nsted acidity and catalytic activity determined in our previous study. A direct correlation between the catalytic activity and the abundance of Br{\o}nsted 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.",

keywords = "Br{\o}nsted acidity, Infrared spectroscopy, Propanol dehydration, Raman spectroscopy, Surface analysis, Titania-supported niobium oxide",

author = "Thomas Onfroy and Manoilova, {Olga V.} and Bukallah, {Saeed B.} and Hercules, {David M.} and Guillaume Clet and Marwan Houalla",

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doi = "10.1016/j.apcata.2006.09.021",

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T1 - Surface structure and catalytic performance of niobium oxides supported on titania

AU - Onfroy, Thomas

AU - Manoilova, Olga V.

AU - Bukallah, Saeed B.

AU - Hercules, David M.

AU - Clet, Guillaume

AU - Houalla, Marwan

PY - 2007/1/10

Y1 - 2007/1/10

N2 - 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.

AB - 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.

KW - Brønsted acidity

KW - Infrared spectroscopy

KW - Propanol dehydration

KW - Raman spectroscopy

KW - Surface analysis

KW - Titania-supported niobium oxide

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VL - 316

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JO - Applied Catalysis A: General

JF - Applied Catalysis A: General

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ER -

Surface structure and catalytic performance of niobium oxides supported on titania

Abstract

Keywords

ASJC Scopus subject areas

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