INVESTIGADORES
PIERELLA Liliana Beatriz
artículos
Título:
Synthesis and characterization of MEL and FAU zeolites doped with
Autor/es:
FEDERICO AZZOLINA JURY, LIONEL ESTEL, ISABELLE POLAERT, LILIANA PIERELLA
Revista:
APPLIED CATALYSIS A-GENERAL
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2013 p. 92 - 101
ISSN:
0926-860X
Resumen:
Doped zeolites with transition metals were prepared for their application to the synthesis of chemical
compounds under microwave irradiation. The zeolite crystalline structures were verified by XRD. Their
surface areas were determined by the BET method. Lewis and Bronsted acid sites were quantified by
FTIR of adsorbed pyridine in zeolites. The characterization of acidic properties revealed the generation
of new Lewis acid sites after transition metal incorporation into zeolites. The dielectric properties of
compacted zeolites were measured by using a reflection method. The temperature profiles of these compacted
beds were measured during heating under microwave irradiation. Heating phenomena in zeolites
were interpreted using a modified Debye model. Two main dielectric mechanisms were determined in
zeolites: rotational polarization phenomenon and interfacial polarization. The selective catalytic oxidation
of styrene with hydrogen peroxide was studied over zeolites doped with transition metals in a batch
system, under conventional and microwave heating. Benzaldehyde was the main product in all the samples
under study. Styrene conversion showed an important influence of the transition metal nature and
content and so, the kind of zeolite structure used. With the present experimental conditions, no difference
was proved between microwave and conventional heating neither on activity nor on selectivity.