INVESTIGADORES
MONTI Gustavo Alberto
artículos
Título:
Synthesis, characterization and catalytic activity of AlSBA-3 mesoporous catalyst having variable silicon-to-aluminum ratios
Autor/es:
M. L. MARTÍNEZ; M. B. GÓMEZ COSTA; O. A. ANUNZIATA; G. A. MONTI
Revista:
MICROPOROUS AND MESOPOROUS MATERIALS
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2011 vol. 144 p. 183 - 190
ISSN:
1387-1811
Resumen:
AlSBA-3 mesoporous catalytic materials with different Si/Al ratios were synthesized; Al was incorporated in the mesoporous structure using the post-synthesis method. The catalysts were characterized using different techniques and methods, such as: XRD, BET, ICP, SEM microcopy, TEM microscopy and 27Al MAS NMR. Acidic properties were estimated by adsorption–desorption using pyridine as probe molecule followed by FTIR spectroscopy. FTIR studies showed the acidic properties with aluminum incorporation; lower Si/Al ratios increase the number of acid sites. Temperature-programmed desorption of pyridine showed that AlSBA-3 has a higher number of strong acid sites compared to other mesoporous materials such as Al-MCM-41, Al-SBA-15 and Al-SBA-16. It has been observed by 27Al MAS NMR spectroscopy, that the materials exhibit peaks with shifts of 50 ± 2 ppm and weak signal at 0 ± 2 ppm. The AlSBA-3 materials used as a catalyst showed high performance in the acid-catalyzed dehydration of isopropanol.