http://www.cnr.it/ontology/cnr/individuo/prodotto/ID180713
The use of H2O2 over titanium-grafted mesoporous silica catalysts: a step further towards sustainable epoxidation (Articolo in rivista)
- Type
- Label
- The use of H2O2 over titanium-grafted mesoporous silica catalysts: a step further towards sustainable epoxidation (Articolo in rivista) (literal)
- Anno
- 2009-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1039/b903302e (literal)
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- Guidotti M.; Pirovano C.; Ravasio N.; Lazaro B.; Fraile J.M.; Mayoral J.A.; Coq B.; Galarneau A. (literal)
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- ISI Web of Science (WOS) (literal)
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- a CNR-Istituto di Scienze e Tecnologie Molecolari, IDECAT-CNR Unit, via Venezian 21, Milano, Italy.
b Instituto de Ciencia de Materiales de Arag´on, IDECAT-CSIC Unit, Fac. Ciencias, Zaragoza, Spain
c Institut Charles Gerhardt Montpellier, UMR 5253 CNRS/UM2/ENSCM/UM1, ENSCM, 8 rue de l'Ecole Normale, 34296, Montpellier, France (literal)
- Titolo
- The use of H2O2 over titanium-grafted mesoporous silica catalysts: a step further towards sustainable epoxidation (literal)
- Abstract
- The epoxidation of cyclohexene with aqueous hydrogen peroxide over mesostructured Ti(Cp)2Cl2-grafted silica catalysts is described for the first time. Three kinds of Ti-containing systems with different textural properties have been employed: Ti/SiO2, Ti/MCM-41 and Ti/MCM-48. A minimal local H2O2 concentration in the surroundings of Ti sites, obtained by a controlled dropwise addition of aqueous H2O2 (4.17 mmol H2O2 h-1 gcat
-1), is crucial for an effective and highly selective epoxidation. Excellent selectivity (>98%) in cyclohexene epoxide is obtained at the end of the slow H2O2 addition in acetonitrile. Higher yields in epoxide are found over Ti/MCM-48 than over Ti/MCM-41 or Ti/SiO2 thanks to better isolation, dispersion and stability of Ti(IV) sites. (literal)
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