SILVA, F.M.N.; http://lattes.cnpq.br/5927253994526787; SILVA, Fabiana Medeiros do Nascimento.
Resumen:
The oil industry increasingly seeks materials that convert heavy hydrocarbons to light
which have a higher added value. The strict environmental laws, the social pressure
for fuel with better performance and the need for use of crude oil more and more
heavy and with high nitrogen content, have generated a great demand for the
development of hydrorefining catalysts. An example of promising catalysts is acidic
mesoporous material because of its wide application as support for solid catalysts in
industrial chemical process, raising a greater interest in many researchers driving
research in this area. The mesoporous molecular sieve, AI-MCM-41 is an interesting
catalyst support due to high thermal and hydrothermal stability, high surface area,
high pore diameters which provide possibilities for the preparation of catalysts that
have high dispersion metal NiMo on AI-MCM-41. Another interesting mesoporous
support in catalysis is the mesoporous silica SBA-15, it has been widely studied,
mainly due to its characteristics: thermal, chemical and mechanics stable, in addition
to its ability to adsorb metal cations, allowing its use as support for metal catalysts.
Thus, the aim of this work was to synthesize and characterize the support MCM-41
with the addition of aluminum (AI-MCM-41) and NiMo catalysts supported. The
support AI-MCM-41 was synthesized with ratio Si/AI= 31,9 through the hydrothermal
method at 150°C for 12 hours and characterized by XRD, EDX, FTIR, MEV and TG.
In this work was used a sample of SBA-15 as support for NiMo catalysts previously
synthesized and ceded to LabCAB by researchers from PUC-RJ. The catalysts were
synthesized by the wet impregnation method and physical dispersion at
concentrations of 4 and 8 wt% Mo03 and 2 wt% NiO and were characterized by
XRD, EDX, FTIR and MEV. The results obtained from the characterization indicated
that the hexagonal phase of the AI-MCM-41 were obtained, after calcination of the
material there as an increase in the characteristic hexagonal ordering of the material.
There was a reduction in the hexagonal phase ordering after impregnation of the
oxides NiO and Mo03, still remain its hexagonal phase of mesoporous molecular
sieve. The wet dispersion on AI-MCM-41 was more efficient when dispersed a lower
Mo03 content and the physical dispersion when the content of Mo03 was increased.
From the thermal analysis it was possible verify good thermal stability for both of
supports, AI-MCM-41 and SBA-15. With the XRD for SBA-15 support, it was found
good organization hexagonal mesoporous followed by hexagonal reduction after
impregnation of the oxides NiO and Mo03. For both types of impregnation of the
oxides on SBA-15 was found the presence of crystalline phases of molybdenum and
niquel.