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Kinetic study of template removal of MCM-41 derived from rice husk ash
(Journal of Thermal Analysis and Calorimetry, 2013) Melo, Marcus Antonio de Freitas; Braga, Renata Martins Braga; Barros, Joana Maria de Farias Barros; Melo, Dulce Maria de Araújo; Aquino, Flávia de Medeiros; Freitas, Júlio Cézar de Oliveira; Santiago, Rodrigo César
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 cetyltrimethyl- ammonium 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.