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Type: Artigo de periódico
Title: Alumina-catalyzed epoxidation with hydrogen peroxide: Recycling experiments and activity of sol-gel alumina
Author: Cesquini, RG
Silva, JMDE
Woitiski, CB
Mandelli, D
Rinaldi, R
Schuchardt, U
Abstract: Commercial alumina looses some activity after the first opoxidation reaction of (S)-limonene with hydrogen peroxide, but maintains a good activity and a very high selectivity in the subsequent three reactions. After this its activity is strongly reduced, probably due to structural modifications. Aluminas obtainc by sol-gel methods are normally less active than the commercial alumina. However, the use of monomeric aluminum sec-butoxide and of oxalic acid to form stable alumina mesophases allows a very active alumina to be obtained, which catalyses the epoxidation of the less reactive cyclohexene with hydrogen peroxide in 98% yield. Close to 50% of the active oxygen is used up in the formation of molecular oxygen.
Subject: catalyst recycling
catalytic epoxidation
cyclohexene oxide
green chemistry
(S)-limonene oxide
sol-gel-derived alumina
Country: Alemanha
Editor: Wiley-v C H Verlag Gmbh
Rights: fechado
Identifier DOI: 10.1002/1615-4169(200209)344:8<911
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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