INVESTIGADORES
PIERELLA Liliana Beatriz
congresos y reuniones científicas
Título:
ZSM-5 modified with cobalt as novel solid catalyst in sulfide oxidation
Autor/es:
CLARA SAUX, HORACIO BONA, LUIS PIZZIO Y LILIANA PIERELLA.
Reunión:
Simposio; 11th International Symposium on the "Scientific Bases for the Preparation of Heterogeneous Catalysts"; 2014
Resumen:
Green chemistry is
one of the tendencies of scientists all over the world. Many efforts are
constantly done to reach new chemical process avoiding waste generation and no desirable products formation. In this way,
heterogeneous catalysis is an important field of growing interest in both
academic and industrial research. In practice, the substitution of homogeneous
catalysts with solid catalysts is very attractive in view of the reduction of
waste formation, as well as for safety and corrosion aspects [1].
In this context, the use of
catalytic processes with Keggin type heteropolycompounds (HPC) has been widely studied
in recent years. One of the reasons is related to the dual character of such
compounds, since they are strong acids and can also act as efficient oxidants [2].
However, the low surface area (< 10 m2/g) and porosity (<
0.1 cm3/g) of bulk HPC, together with a high solubility in polar
solvents, lead to the search of supports that can immobilize them [3]. For this purpose, the use of
zeolites as highly ordered and with an unusual high surface area seems to be an
interesting alternative as support of the HPC. Zeolites are crystalline
microporous aluminosilicates offering a plethora of modifications and
opportunities for further improvement of their properties [4].
Research in the field of
the catalytic oxidation of sulfides is promoted due to several reasons: (a) the
synthesis of different chemically and biologically important molecules and (b)
the removal of sulfur from industrial products and wastes, in order to comply
with environmental legislations [5]. The oxidation of
2-(methylthio)benzothiazole was chosen as model reaction for this study since
this substrate is present in diverse and important organic compounds that were
used in distinct industrial processes and the corresponding sulfoxide and
sulfone are more biodegradable than the substrate.