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|Type:||Artigo de evento|
|Title:||Cyclooctene Epoxidation Using Nb-mcm-41 Synthesized At Room Temperature|
|Abstract:||An efficient and simple method for preparing Nb-MCM-41 has been developed. The mesoporous material Nb-MCM-41 was synthesized at room temperature using tetraethoxysilane (TEOS), tetramethylammonium hydroxide (TMAOH), cetyltrimethylammonium bromide (CTMABr) as template and NH 4[NbO(C2O4)2(H2O) 2]·(H2O)3, as the niobium source. The materials were characterized by X-ray diffraction (XRD), FT-IR and diffuse reflectance UV-vis spectroscopies. The characterization showed that most of the niobium was incorporated into the framework of MCM-41. Nb-MCM-41 was tested in the epoxidation of cis-cyclooctene using t-butyl hydroperoxide as oxidant and a catalystxyclooctene molar ratio of 1:1000. The activity of Nb-MCM-41 increases with the temperature of the reaction. Cyclooctene oxide was obtained with 50% yield after 24 h at 333 K, without formation of any by-products.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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