Abstracts Book - IMRC 2018

• SF3-P028
CATALYTIC PERFORMANCE OF Co-Mo-W-S CATALYSTS
SUPPORTED ON HIERARCHICALLY STRUCTURED POROUS SILICAS
FOR HDS REACTIONS
Mario Alberto López 1 , Eric M. Rivera Muñoz 1 , Batriz Marcela Millán Malo 1 , Carmen Leticia Peza
Ledesma 2 , Rufino Nava Mendoza 3 , Rafael Huirache 4
1 Universidad Nacional Autónoma de México, Dept. of Nanotechnology - CFATA, Mexico.
2 Universidad Nacional Autónoma de México, Centro de Física Aplicada y Tecnología Avanzada,
Mexico. 3 Universidad Autónoma de Querétaro, Facultad de Ingeniería, Mexico. 4 Universidad
Michoacana de San Nicolás de Hidalgo, Departamento de Ingeniería Química, Mexico.
Materials with hierarchical porosity are those which contains porous structures
in the range of micro, meso and macropores; and, due to its unique properties,
they have generated substantial interest in recent materials science research, in
applications such as biomaterials, semiconductors, chemical separation and
catalysis. [1-4]. These materials combine the properties of high surface area and
chemical selectivity provided by the microporous and mesoporous materials
and the low mass transfer and diffusion limitations related to macroporous
materials; this fact makes them especially useful in applications such as catalysis
and separation of chemical compounds where both features are significant
[5]. In this work, monolithic silica materials with hierarchical porosity were
synthesized by the sol-gel method combined with a dual hard-soft templating
route. Silica materials were used for the synthesis of Co-Mo-W-S catalysts by the
immersión technique using transition metal salts as precursors followed by
sulfidation in H 2 S/H 2 gas current. The synthetized catalysts were characterized
by physicochemical techniques (DRS-UV-Vis, Micro Raman Spectroscopy, XRD,
EDS, ED-XRF, FE-SEM, Nitrogen physisorption and Mercury porosimetry) in order
to determine their structural and physicochemical properties and were tested
in dibenzothiophene desulfurization reactions. It have been seen that the use
of hierarchical porous materials as catalytic supports to have an advantage with
respect to the use of mesoporous materials since the presence of different
levels of porosity provides a sinergetic effect between the properties of micro,
meso and macropores which results in a substantial improvement in the
catalytic performance of catalysts supported on hierarchically porous materials
respect to those supported in mesoporous silica.
References:
[1] Su, B.-L.; Sánchez, C. y Yang, X.-Y. (2012). Hierarchically Structured Porous