Synthesis and characterization of Al- and Ti-MCM-41 materials: application to oxidation of anthracene

• Autor(a) principal: Araújo,R. S.
• Data de Publicação: 2007
• Outros Autores: Costa,F. S., Maia,D. A. S., Sant'Ana,H. B., Cavalcante Jr.,C. L.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Brazilian Journal of Chemical Engineering
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322007000100012
• topic: Synthesis; Characterization; MCM-4; Anthracene oxidation

The synthesis and characterization of new molecular sieves of the MCM-41 type are presented in this study. Samples were obtained from the alkoxides of Si, Ti and Al and different long-chain amine and alkylammonium salts surfactants, by the sol-gel method, through moderate agitation at room temperature. The reactions were conducted in two steps, acid hydrolysis (pH=2) and alkaline condensation (pH=10), both taking about 90min. The synthesized crystals were characterized using infrared spectroscopy, thermogravimetry and X-Ray diffraction. Pore diameters and surface areas were measured by N2 adsorption at 77K. Catalytic tests were conducted for anthracene oxidation using different oxidants (H2O2, alkylhydroperoxide) and organic solvents (benzene, tetrahydrofuran).