Cyclooctene epoxidation using Nb-MCM-41 and Ti-MCM-41 synthesized at room temperature

Autor(es)

Gallo, Jean Marcel R. ; Schuchardt, Ulf Friedrich ; Paulino, Icaro Sampaio ^[3]

• Tipo de documento: Artigo Científico
• Fonte: APPLIED CATALYSIS A-GENERAL; v. 266, n. 2, p. 223-227, July 2004.
• Área do conhecimento: Ciências Exatas e da Terra - Química
• Assunto(s): Catalisadores

Resumo

An efficient and simple method for preparing titanium or niobium containing MCM-41 has been developed. The mesoporous materials were synthesized at room temperature using tetraethoxysilane (TEOS), cetyltrimethylammonium bromide (CTMABr) as template and (NH4)(2)TiF6 or NH4[NbO(C2O4)(2)(H2O)(2)].(H2O)(3) as metal source. The materials were characterized by X-ray diffraction (XRD),FT-IR and diffuse reflectance UV-Vis spectroscopies, which showed that most of the metal was incorporated into the framework of MCM-41. Ti and Nb containing MCM-41 were tested in the solvent-free epoxidation of cis-cyclooctene using tert-butyl hydroperoxide as oxidant and a catalyst: cyclooctene molar ratio of 1:1000. After 24h of reaction using Ti-MCM-41 and Nb-MCM-41 as catalyst, we obtained 82 and 65% yields of cyclooctene oxide, respectively, without formation of any by-products. (AU)

• Processo FAPESP: 99/02649-5 - Polimerização de alfa-olefinas com catalisadores de Ziegler-Natta a base de ferro e cobalto
• Beneficiário: Icaro Sampaio Paulino
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 02/03401-1 - Epoxidacao de terpenos catalisada por nb-mcm-41.
• Beneficiário: Jean Marcel Ribeiro Gallo
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica