Artigo
Determination of the acidity of MCM-41 with different Si/Al ratios by the temperature programmed Desorption of Pyridine
Registro en:
0263-6174
© Multi-Science Publishing
Autor
Souza, Anne Michelle Garrido Pedrosa
Souza, Marcelo José Barros de
Coutinho, Ana C.S.L.S.
Araujo, Antonio Souza de
Lima, Stevie H.
Institución
Resumen
Mesoporous catalysts of MCM-41 type with different Si/Al ratios were synthesized by the hydrothermal method and characterized by X-ray diffraction, nitrogen adsorption and thermogravimetric analysis. Their acidic properties were determined via the temperature programmed desorption of pyridine. Vyazovkin kinetic models were used to correlate the total acidity as a function of the Si/Al ratio with the apparent activation energy for pyridine desorption. The results obtained indicated that the catalysts possessed weak and medium acidic sites. An increase in the Si/Al ratio led to an increase in the activation energy for pyridine desorption.