Supported tantalum oxide and supported vanadia-tantala mixed oxides: Structural characterization and surface properties

M Baltes; A Kytokivi; BM Weckhuysen; RA Schoonheydt; P Van Der Voort; EF Vansant

doi:10.1021/jp010628b

Supported tantalum oxide and supported vanadia-tantala mixed oxides: Structural characterization and surface properties

M Baltes, A Kytokivi, BM Weckhuysen, RA Schoonheydt, P Van Der Voort, EF Vansant

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

Abstract

Silica-, alumina-, and zirconia-supported tantalum oxide and supported vanadia-tantala mixed oxide catalysts were investigated by XRD, UV-vis-DR, FTIR, and FT-Raman spectroscopy to determine the nature of the surface tantala species. Two types of surface TaOx species were identified. On the SiO2 support, at low coverages tetrahedral TaO4 species exist, with a Ta=O bond and three bridging Ta-O-support bonds, At higher coverages, octahedral TaO6 species occur. On Al2O3 and ZrO2 both surface species exist already at considerably low Ta loading. The acidic properties of the catalysts were investigated by an FTIR study of adsorbed pyridine. Supported tantala is clearly more Lewis acidic in comparison to vanadia. The oxidation of methanol was used to probe the catalytic performance of the supported oxide species and from the activity and product distribution it is concluded that supported tantala predominantly shows acidic over redox behavior.

Original language	English
Pages (from-to)	6211-6220
Number of pages	10
Journal	Journal of Physical Chemistry. B
Volume	105
Issue number	26
DOIs	https://doi.org/10.1021/jp010628b
Publication status	Published - 5 Jul 2001

Keywords

Molecular designed dispersion
Catalytic-properties
Methanol oxidation
Silica-alumina
Reactivity
Niobium
Phase
Deposition
Zirconia
Tio2

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title = "Supported tantalum oxide and supported vanadia-tantala mixed oxides: Structural characterization and surface properties",

abstract = "Silica-, alumina-, and zirconia-supported tantalum oxide and supported vanadia-tantala mixed oxide catalysts were investigated by XRD, UV-vis-DR, FTIR, and FT-Raman spectroscopy to determine the nature of the surface tantala species. Two types of surface TaOx species were identified. On the SiO2 support, at low coverages tetrahedral TaO4 species exist, with a Ta=O bond and three bridging Ta-O-support bonds, At higher coverages, octahedral TaO6 species occur. On Al2O3 and ZrO2 both surface species exist already at considerably low Ta loading. The acidic properties of the catalysts were investigated by an FTIR study of adsorbed pyridine. Supported tantala is clearly more Lewis acidic in comparison to vanadia. The oxidation of methanol was used to probe the catalytic performance of the supported oxide species and from the activity and product distribution it is concluded that supported tantala predominantly shows acidic over redox behavior.",

keywords = "Molecular designed dispersion, Catalytic-properties, Methanol oxidation, Silica-alumina, Reactivity, Niobium, Phase, Deposition, Zirconia, Tio2",

author = "M Baltes and A Kytokivi and BM Weckhuysen and RA Schoonheydt and {Van Der Voort}, P and EF Vansant",

year = "2001",

month = jul,

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doi = "10.1021/jp010628b",

language = "English",

volume = "105",

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AU - Baltes, M

AU - Kytokivi, A

AU - Weckhuysen, BM

AU - Schoonheydt, RA

AU - Van Der Voort, P

AU - Vansant, EF

PY - 2001/7/5

Y1 - 2001/7/5

N2 - Silica-, alumina-, and zirconia-supported tantalum oxide and supported vanadia-tantala mixed oxide catalysts were investigated by XRD, UV-vis-DR, FTIR, and FT-Raman spectroscopy to determine the nature of the surface tantala species. Two types of surface TaOx species were identified. On the SiO2 support, at low coverages tetrahedral TaO4 species exist, with a Ta=O bond and three bridging Ta-O-support bonds, At higher coverages, octahedral TaO6 species occur. On Al2O3 and ZrO2 both surface species exist already at considerably low Ta loading. The acidic properties of the catalysts were investigated by an FTIR study of adsorbed pyridine. Supported tantala is clearly more Lewis acidic in comparison to vanadia. The oxidation of methanol was used to probe the catalytic performance of the supported oxide species and from the activity and product distribution it is concluded that supported tantala predominantly shows acidic over redox behavior.

AB - Silica-, alumina-, and zirconia-supported tantalum oxide and supported vanadia-tantala mixed oxide catalysts were investigated by XRD, UV-vis-DR, FTIR, and FT-Raman spectroscopy to determine the nature of the surface tantala species. Two types of surface TaOx species were identified. On the SiO2 support, at low coverages tetrahedral TaO4 species exist, with a Ta=O bond and three bridging Ta-O-support bonds, At higher coverages, octahedral TaO6 species occur. On Al2O3 and ZrO2 both surface species exist already at considerably low Ta loading. The acidic properties of the catalysts were investigated by an FTIR study of adsorbed pyridine. Supported tantala is clearly more Lewis acidic in comparison to vanadia. The oxidation of methanol was used to probe the catalytic performance of the supported oxide species and from the activity and product distribution it is concluded that supported tantala predominantly shows acidic over redox behavior.

KW - Molecular designed dispersion

KW - Catalytic-properties

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KW - Reactivity

KW - Niobium

KW - Phase

KW - Deposition

KW - Zirconia

KW - Tio2

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Supported tantalum oxide and supported vanadia-tantala mixed oxides: Structural characterization and surface properties

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