Manganese Mono-Substituted Borotungstate: Characterization and Catalytic Application

Abstract:

The Keggin-type TBA₄H₂[BW₁₁Mn(H₂O)O₃₉].H₂O (BW₁₁Mn) compound was isolated and characterized. The first sphere of coordination for the manganese atom was determined by EXAFS analysis. Six oxygen atoms were found in the range of 1.80-2.64 Å from the manganese. BW₁₁Mn showed to be an active, efficient and selective catalyst for cis-cyclooctene (1a) epoxidation in the presence of stoichiometric quantities of H₂O₂. After 5 h of reaction almost complete conversion was achieved (86% of conversion). Selectivity was always 100 % for the epoxide.

• Periodical: Materials Science Forum (Volumes 730-732)
• Pages: 975-980
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.730-732.975
• Online since: November 2012
• Authors: Salete S. Balula, Isabel C.M.S. Santos, André D.S. Barbosa, Walkiria Schlindwein, Ana M.V. Cavaleiro, Baltazar de Castro, Luís Cunha-Silva
• Keywords: Epoxidation, EXAFS Spectroscopy, Polyoxometalate

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