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|Type:||Artigo de periódico|
|Title:||MOSSBAUER AND SOLID-STATE NMR SPECTROSCOPIC STUDIES OF TIN-MODIFIED RHENIUM-BASED METATHESIS CATALYSTS|
|Abstract:||Mossbauer and solid-state NMR spectroscopic studies have been carried out on Re2O7/SiO2-Al2O3/SnR(4) metathesis catalysts (R = Me, Et or n-Bu). The effects of both the rhenium loading and the SnR(4) alkyl group are presented. The amounts of gas released upon the interaction between Re2O7/SiO2-Al2O3 and SnR(4) do not correspond to a simple stoichiometry while chemical reactivity suggests the presence of minor amounts of a rhenium-alkylidene species. Mossbauer and NMR data suggest two kinds of tin sites, with the tin atom linked to the surface by one or two Sn-O bonds. The effects of exposure to air and catalyst regeneration on the tin environment have also been investigated. The nature of the tin-containing surface species is discussed.|
|Editor:||Royal Soc Chemistry|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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