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Type: Artigo de periódico
Title: Mössbauer And Solid-state Nmr Spectroscopic Studies Of Tin-modified Rhenium-based Metathesis Catalysts
Author: Buffon R.
Schuchardt U.
Abras A.
Abstract: Mössbauer 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 SnR4 alkyl group are presented. The amounts of gas released upon the interaction between Re2O7/SiO2-Al2O3 and SnR4 do not correspond to a simple stoichiometry while chemical reactivity suggests the presence of minor amounts of a rhenium-alkylidene species. Mössbauer 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.
Rights: aberto
Identifier DOI: 10.1039/FT9959103511
Date Issue: 1995
Appears in Collections:Unicamp - Artigos e Outros Documentos

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