Portal de Periódicos da CAPES

Artigo Acesso aberto Produção Nacional Revisado por pares

BIBTEX RIS

Kinetic study of template removal of MCM-41 derived from rice husk ash

2012; Springer Science+Business Media; Volume: 111; Issue: 2 Linguagem: Inglês

10.1007/s10973-012-2516-y

1588-2926

Renata Martins Braga, Joana M. F. Barros, Dulce Maria de Araújo Melo, M. A. F. Melo, Flávia de Medeiros Aquino, Júlio Cézar de Oliveira Freitas, Rodrigo César Santiago,

Catalytic Processes in Materials Science

Molecular sieves MCM-41 were synthesized from rice husk ash (RHA) as alternative sources of silica, called RHA MCM-41. The material was synthesized by a hydrothermal method from a gel with the molar composition 1.00 CTMABr:4.00 SiO2:1.00 Na2O:200.00 H2O at 100 °C for 120 h with pH correction. The cetyltrimethylammonium bromide (CTMABr) was used as a structure template. The material was characterized by X-ray powder diffraction, FTIR, TG/DTG, and surface area determination by the BET method. The kinetics models proposed by Ozawa, Flynn–Wall, and Vyazovkin were used to determine the apparent activation energy for CTMA+ species decomposition from the pores of MCM-41 material. The results were compared with those obtained from the MCM-41 synthesized with silica gel. The synthesized material had specific surface area, size, and pore volume as specified by mesoporous materials developed from conventional sources of silica.