Precursor nuclearity effects in supported vanadium oxides prepared by organometallic grafting

Staci L. Wegener, Hacksung Kim, Tobin J Marks, Peter C Stair

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Despite widespread importance in catalysis, the active and selective sites of supported vanadium oxide (VOx) catalysts are not well understood. Such catalysts are of great current interest because of their industrial significance and potential for selective oxidation processes.(1-4)However, the fact that the nature of the active and selective sites is ambiguous hinders molecular level understanding of catalytic reactions and the development of new catalysts. Furthermore, complete structural elucidation requires isolation and characterization of specific vanadium oxide surface species, the preparation of which presents a significant synthetic challenge. In this study, we utilize the structural uniformity inherent in organometallic precursors for the preparation of supported vanadium oxide catalysts. The resulting catalysts are characterized by UV-visible diffuse reflectance spectroscopy (UV-vis DRS), X-ray absorption spectroscopy (XAS), UV-Raman spectroscopy, and H2-temperature programmed reduction (H2-TPR). Significant structural and reactivity differences are observed in catalysts prepared from different organometallic precursors, indicating that the chemical nature of surface vanadia can be influenced by the nuclearity of the precursor used for grafting.

Original languageEnglish
Pages (from-to)170-175
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume2
Issue number3
DOIs
Publication statusPublished - Feb 3 2011

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Vanadium
vanadium oxides
Organometallics
Oxides
catalysts
Catalysts
preparation
X ray absorption spectroscopy
Ultraviolet spectroscopy
Catalysis
catalysis
Raman spectroscopy
isolation
absorption spectroscopy
reactivity
Spectroscopy
reflectance
Oxidation
oxidation
spectroscopy

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Precursor nuclearity effects in supported vanadium oxides prepared by organometallic grafting. / Wegener, Staci L.; Kim, Hacksung; Marks, Tobin J; Stair, Peter C.

In: Journal of Physical Chemistry Letters, Vol. 2, No. 3, 03.02.2011, p. 170-175.

Research output: Contribution to journalArticle

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