IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
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.