Artigo submetido em abril de 2013 e aceito em outubro de 2013
RESUMOAs peneiras moleculares MCM-41 têm atraído grande interesse devido as suas propriedades de alta área específica, volume e diâmetro de poros controláveis. Estes materiais são aplicados em diversos ramos da indústria química como adsorventes, suportes catalíticos e catalisadores heterogêneos em vários processos. , com dimensões e volume de poros dentro das especificações de materiais mesoporosos, sendo estas prorpriedades semelhantes ao MCM-41 sintetizado com a sílica gel comercial, comprovando que a cinza da casca do arroz pode ser utilizada como fonte alternativa de sílica na síntese de peneiras moleculares do tipo MCM-41.
PALAVRAS-CHAVE:MCM-41, síntese hidrotérmica, sílica, cinza da casca do arroz
SYNTHESIS OF MCM-41 MOLECULAR SIEVE DERIVED FROM RICE HUSK ASH ABSTRACTMCM-41 molecular sieves attracted great interest due their properties, as high specific surface area, controllable diameter and pore volume. These materials have been applied as adsorbents, catalyst supports, and heterogeneous catalysts in various branches of the chemical industry. In this work, MCM-41 was synthesized from rice husk ash, natural and chemically treated, as alternative sources of silica, called CCA-MCM-41 and CCAL-MCM-41, respectively, with the aim of reusing this residue and produce a lower cost mesoporous material. The materials were synthesized by the hydrothermal method from a gel composition: CTAMBr 1,0 mol L -1 ; SiO 2 4,0 mol L -1 ; Na 2 O 1,0 mol L -1 ; H 2 O 200 mol L -1 ; and characterized by XRF, XRD, FT-IR and specific surface area determination by the BET method. The materials showed high specific surface area (905 m 2 g -1 ), with dimensions and pore volume within the specifications of mesoporous materials, which are proprieties similar to MCM-41 synthesized with commercial silica gel, proving that rice husk ash can be used as an alternative source of silica for the synthesis of MCM-41 molecular sieves.
