Understanding the Synthesis of Supported Vanadium Oxide Catalysts Using Chemical Grafting

Understanding the Synthesis of Supported Vanadium Oxide Catalysts Using Chemical Grafting The complexity of variables during incipient wetness impregnation synthesis of supported metal oxides precludes an in‐depth understanding of the chemical reactions governing the formation of the dispersed oxide sites. This contribution describes the use of vapor phase deposition chemistry (also known as grafting) as a tool to systematically investigate the influence of isopropanol solvent on VO(OiPr)3 anchoring during synthesis of vanadium oxide on silica. The availability of anchoring sites on silica was found to depend not only on the pretreatment of the silica but also on the solvent present. H‐bond donors can reduce the reactivity of isolated silanols whereas disruption of silanol nests by H‐bond acceptors can turn unreactive H‐bonded silanols into reactive anchoring sites. The model suggested here can inform improved syntheses with increased dispersion of metal oxides on silica. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Chemistry - A European Journal Wiley

Understanding the Synthesis of Supported Vanadium Oxide Catalysts Using Chemical Grafting

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Publisher
Wiley
Copyright
© 2020 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN
0947-6539
eISSN
1521-3765
DOI
10.1002/chem.201904260
Publisher site
See Article on Publisher Site

Abstract

The complexity of variables during incipient wetness impregnation synthesis of supported metal oxides precludes an in‐depth understanding of the chemical reactions governing the formation of the dispersed oxide sites. This contribution describes the use of vapor phase deposition chemistry (also known as grafting) as a tool to systematically investigate the influence of isopropanol solvent on VO(OiPr)3 anchoring during synthesis of vanadium oxide on silica. The availability of anchoring sites on silica was found to depend not only on the pretreatment of the silica but also on the solvent present. H‐bond donors can reduce the reactivity of isolated silanols whereas disruption of silanol nests by H‐bond acceptors can turn unreactive H‐bonded silanols into reactive anchoring sites. The model suggested here can inform improved syntheses with increased dispersion of metal oxides on silica.

Journal

Chemistry - A European JournalWiley

Published: Oct 22, 2021

Keywords: ; ; ; ;

References

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