Thermal restructuring of silica-grafted -CrO2Cl and -VOCl 2 species

Philipp Mania, Sabrina Conrad, René Verel, Ceri Hammond, Ive Hermans

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The volatile molecular precursors CrO2Cl2 and VOCl3 were grafted to thermally dehydrated silica in order to obtain site-isolated, monopodal SiO-MOxCly-1 species (M = V, Cr). Thermal restructuring under dynamic vacuum was investigated up to 450°C with different spectroscopic techniques (viz., NMR, UV-Vis, IR, Raman and XPS). During this thermal restructuring, VOCl3 or CrO2Cl 2 is partially eliminated from the surface, whilst the remaining surface species become multiply bound to the silica surface. This restructuring increases both the chemical and thermal stability of these materials, and has significant consequences for their performance as heterogeneous catalysts.

Original languageEnglish (US)
Pages (from-to)12725-12732
Number of pages8
JournalDalton Transactions
Volume42
Issue number35
DOIs
StatePublished - Sep 21 2013

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