Influence of the metal oxide substrate structure on vanadium oxide monomer formation

Alexis M. Johnson, Brian R. Quezada, Laurence D. Marks, Peter C Stair

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Vanadium oxide (VOx) molecular species supported on high surface area oxide supports are active catalysts for oxidative transformations of organic molecules. Since the reactivity of VOx species depends on their molecular structure, the understanding and control of factors that determine their structure would be useful in surface molecular catalyst design. Reactive adsorption of vanadyl triisopropoxide (VOTP) to form monomeric VO x species on amorphous Al2O3 and SrTiO 3 (001) surfaces has been studied by X-ray photoelectron spectroscopy (XPS). Quantitative comparison of C(1s) and V(2p3/2) peak areas has been used to determine the number of isopropoxide ligands that are replaced by V-O surface bonds. On average, three V-O surface bonds are formed during adsorption on an amorphous Al2O3 surface, as expected in the formation of a tridentate, VO4 structure, typically assigned to monomeric, surface VOx species. On the SrTiO3 (001) surface, the number of V-O surface bonds depends on the oxygen density prior to reaction with VOTP. For adsorption on the SrTiO3 surface cleaned and oxygen-annealed in ultrahigh vacuum, the number of V-O surface bonds is ca. 2. When the SrTiO3 surface has been Ar-ion sputtered prior to VOTP adsorption, the number of V-O bonds is ca. 1. This study demonstrates that the atomic structure of the support can strongly influence the molecular nature of surface VOx species.

Original languageEnglish
Pages (from-to)177-187
Number of pages11
JournalTopics in Catalysis
Volume57
Issue number1-4
DOIs
Publication statusPublished - Feb 2014

Fingerprint

Vanadium
Oxides
Monomers
Metals
Substrates
Adsorption
Oxygen
Catalysts
Vanadates
Ultrahigh vacuum
Catalyst supports
Molecular structure

Keywords

  • Strontium titanate
  • Surface structure
  • Vanadium oxide
  • XPS

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Cite this

Influence of the metal oxide substrate structure on vanadium oxide monomer formation. / Johnson, Alexis M.; Quezada, Brian R.; Marks, Laurence D.; Stair, Peter C.

In: Topics in Catalysis, Vol. 57, No. 1-4, 02.2014, p. 177-187.

Research output: Contribution to journalArticle

Johnson, Alexis M. ; Quezada, Brian R. ; Marks, Laurence D. ; Stair, Peter C. / Influence of the metal oxide substrate structure on vanadium oxide monomer formation. In: Topics in Catalysis. 2014 ; Vol. 57, No. 1-4. pp. 177-187.
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