A low-energy ion scattering (LEIS) study of the influence of the vanadium concentration on the activity of vanadium-niobium oxide catalysts for the oxidative dehydrogenation of propane

R.H.H. Smits, R.H.H. Smits, Kulathuiyer Seshan, J.R.H. Ross, J.R.H. Ross, L.C.A. van den Oetelaar, J.H.J.M. Helwegen, M.R. Anantharaman, H.H. Brongersma

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Abstract

A series of vanadium-niobium oxide catalysts in which the vanadia content varies between 0.3 and 18 mol% was prepared by coprecipitation. These catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), low-energy ion scattering (LEIS), and by catalytic testing in the oxidative dehydrogenation reaction of propane. The results of the surface analysis by XPS and LEIS are compared, It is concluded that the active site on the catalyst surface contains 2.0 ± 0.3 vanadium atoms on average. This can be understood by assuming the existence of two or three different sites: isolated vanadium atoms, pairs of vanadium atoms, or ensembles of three vanadium atoms. At higher vanadium concentration more vanadium clusters with a higher activity are at the surface. LEIS revealed that as the vanadium concentration in the catalyst increases, vanadium replaces niobium at the surface. At vanadium concentrations above 8 mol%, new phases such as ß-(Nb, V)2O5 which are less active because vanadium is present in isolated sites are formed, while the vanadium surface concentration shows a slight decrease.
Original languageUndefined
Pages (from-to)1043-1050
Number of pages8
JournalJournal of catalysis
Volume157
Issue number2
DOIs
Publication statusPublished - 1995

Keywords

  • METIS-105486
  • IR-10085

Cite this

Smits, R.H.H. ; Smits, R.H.H. ; Seshan, Kulathuiyer ; Ross, J.R.H. ; Ross, J.R.H. ; van den Oetelaar, L.C.A. ; Helwegen, J.H.J.M. ; Anantharaman, M.R. ; Brongersma, H.H. / A low-energy ion scattering (LEIS) study of the influence of the vanadium concentration on the activity of vanadium-niobium oxide catalysts for the oxidative dehydrogenation of propane. In: Journal of catalysis. 1995 ; Vol. 157, No. 2. pp. 1043-1050.
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title = "A low-energy ion scattering (LEIS) study of the influence of the vanadium concentration on the activity of vanadium-niobium oxide catalysts for the oxidative dehydrogenation of propane",
abstract = "A series of vanadium-niobium oxide catalysts in which the vanadia content varies between 0.3 and 18 mol{\%} was prepared by coprecipitation. These catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), low-energy ion scattering (LEIS), and by catalytic testing in the oxidative dehydrogenation reaction of propane. The results of the surface analysis by XPS and LEIS are compared, It is concluded that the active site on the catalyst surface contains 2.0 ± 0.3 vanadium atoms on average. This can be understood by assuming the existence of two or three different sites: isolated vanadium atoms, pairs of vanadium atoms, or ensembles of three vanadium atoms. At higher vanadium concentration more vanadium clusters with a higher activity are at the surface. LEIS revealed that as the vanadium concentration in the catalyst increases, vanadium replaces niobium at the surface. At vanadium concentrations above 8 mol{\%}, new phases such as {\ss}-(Nb, V)2O5 which are less active because vanadium is present in isolated sites are formed, while the vanadium surface concentration shows a slight decrease.",
keywords = "METIS-105486, IR-10085",
author = "R.H.H. Smits and R.H.H. Smits and Kulathuiyer Seshan and J.R.H. Ross and J.R.H. Ross and {van den Oetelaar}, L.C.A. and J.H.J.M. Helwegen and M.R. Anantharaman and H.H. Brongersma",
year = "1995",
doi = "10.1006/jcat.1995.1323",
language = "Undefined",
volume = "157",
pages = "1043--1050",
journal = "Journal of catalysis",
issn = "0021-9517",
publisher = "Academic Press Inc.",
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}

Smits, RHH, Smits, RHH, Seshan, K, Ross, JRH, Ross, JRH, van den Oetelaar, LCA, Helwegen, JHJM, Anantharaman, MR & Brongersma, HH 1995, 'A low-energy ion scattering (LEIS) study of the influence of the vanadium concentration on the activity of vanadium-niobium oxide catalysts for the oxidative dehydrogenation of propane' Journal of catalysis, vol. 157, no. 2, pp. 1043-1050. https://doi.org/10.1006/jcat.1995.1323

A low-energy ion scattering (LEIS) study of the influence of the vanadium concentration on the activity of vanadium-niobium oxide catalysts for the oxidative dehydrogenation of propane. / Smits, R.H.H.; Smits, R.H.H.; Seshan, Kulathuiyer; Ross, J.R.H.; Ross, J.R.H.; van den Oetelaar, L.C.A.; Helwegen, J.H.J.M.; Anantharaman, M.R.; Brongersma, H.H.

In: Journal of catalysis, Vol. 157, No. 2, 1995, p. 1043-1050.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - A low-energy ion scattering (LEIS) study of the influence of the vanadium concentration on the activity of vanadium-niobium oxide catalysts for the oxidative dehydrogenation of propane

AU - Smits, R.H.H.

AU - Smits, R.H.H.

AU - Seshan, Kulathuiyer

AU - Ross, J.R.H.

AU - Ross, J.R.H.

AU - van den Oetelaar, L.C.A.

AU - Helwegen, J.H.J.M.

AU - Anantharaman, M.R.

AU - Brongersma, H.H.

PY - 1995

Y1 - 1995

N2 - A series of vanadium-niobium oxide catalysts in which the vanadia content varies between 0.3 and 18 mol% was prepared by coprecipitation. These catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), low-energy ion scattering (LEIS), and by catalytic testing in the oxidative dehydrogenation reaction of propane. The results of the surface analysis by XPS and LEIS are compared, It is concluded that the active site on the catalyst surface contains 2.0 ± 0.3 vanadium atoms on average. This can be understood by assuming the existence of two or three different sites: isolated vanadium atoms, pairs of vanadium atoms, or ensembles of three vanadium atoms. At higher vanadium concentration more vanadium clusters with a higher activity are at the surface. LEIS revealed that as the vanadium concentration in the catalyst increases, vanadium replaces niobium at the surface. At vanadium concentrations above 8 mol%, new phases such as ß-(Nb, V)2O5 which are less active because vanadium is present in isolated sites are formed, while the vanadium surface concentration shows a slight decrease.

AB - A series of vanadium-niobium oxide catalysts in which the vanadia content varies between 0.3 and 18 mol% was prepared by coprecipitation. These catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), low-energy ion scattering (LEIS), and by catalytic testing in the oxidative dehydrogenation reaction of propane. The results of the surface analysis by XPS and LEIS are compared, It is concluded that the active site on the catalyst surface contains 2.0 ± 0.3 vanadium atoms on average. This can be understood by assuming the existence of two or three different sites: isolated vanadium atoms, pairs of vanadium atoms, or ensembles of three vanadium atoms. At higher vanadium concentration more vanadium clusters with a higher activity are at the surface. LEIS revealed that as the vanadium concentration in the catalyst increases, vanadium replaces niobium at the surface. At vanadium concentrations above 8 mol%, new phases such as ß-(Nb, V)2O5 which are less active because vanadium is present in isolated sites are formed, while the vanadium surface concentration shows a slight decrease.

KW - METIS-105486

KW - IR-10085

U2 - 10.1006/jcat.1995.1323

DO - 10.1006/jcat.1995.1323

M3 - Article

VL - 157

SP - 1043

EP - 1050

JO - Journal of catalysis

JF - Journal of catalysis

SN - 0021-9517

IS - 2

ER -