Artículos de revistas
MOSSBAUER AND SOLID-STATE NMR SPECTROSCOPIC STUDIES OF TIN-MODIFIED RHENIUM-BASED METATHESIS CATALYSTS
Registro en:
Journal Of The Chemical Society-faraday Transactions. Royal Soc Chemistry, v. 91, n. 19, n. 3511, n. 3517, 1995.
0956-5000
WOS:A1995TA54700027
10.1039/ft9959103511
Autor
BUFFON, R
SCHUCHARDT, U
ABRAS, A
Institución
Resumen
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. 91 19 3511 3517