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allied
academies
Journal of Materials Science and Nanotechnology | Volume 2
July 23-25, 2018 | Moscow, Russia
Materials Science and Engineering
International Conference on
NOx reduction via selective catalytic reduction with NH3 over Cu-ZnO loaded onto core-shell Al-
MCM-41: The effect of metal loading
Kongkachuichay P
and
Imyen T
Kasetsart University, Thailand
A
series of Cu-ZnO/core-shell Al-MCM-41 catalysts having
different metal loadings of 3, 5, and 7 wt% (with Cu:ZnO
ratio of 1:1) was studied for NOx reduction via selective catalytic
reduction (SCR) with NH3 at 300 °C. Copper was loaded onto
core-shell Al-MCM-41 by a combination of three methods like
substitution, ion-exchange, and impregnation to obtain various
forms of copper species, while zinc was loaded by impregnation
methodtoobtainZnOformonly.Thephysicochemicalproperties
of the prepared catalysts were investigated by N
2
physisorption,
transmissionelectronmicroscopy (TEM), X-ray diffraction (XRD),
temperature programmed desorption of NH
3
(NH
3
-TPD), H
2
temperature programmed reduction (H
2
-TPR), X-ray adsorption
spectroscopy (XAS), and X-ray photoelectron spectroscopy
(XPS). TEM images reveal that the core-shell structure of the
catalysts was remain intact after metal loading. H2-TPR profiles
indicated that the Cu reducibility decreased with increasing
metal content, which agreed with XPS results, as the peak
shifting to higher binding energy. The catalytic performance
test demonstrated that Cu-ZnO/core-shell Al-MCM-41 with
total metal content of 5wt%exhibited the best catalytic activity,
as it possessed a proper amount of Cu
+
ion, which is the active
species for this reaction. The average NO conversions based on
the reaction time of 3 h of 1.5Cu-1.5ZnO/Al-MCM-41, 2.5Cu-
2.5ZnO/Al-MCM-41, and 3.5Cu-3.5ZnO/Al-MCM-41 were
80, 87, and 73 %, respectively. The effects of Cu:ZnO ratio
was also studied based on Cu content of 2.5 wt%. However,
it was found that the optimum ratio of Cu:ZnO ratio was 1:1.
e:
paisan.k@ku.ac.thDesigning polymeric membranes for biomedical applications
Laís Pellizzer Gabriel, André Luiz Jardini
and
Rubens Maciel Filho
State University of Campinas, Brazil
O
ne of the current challenge of Tissue Engineering is to
produce a new generation of polymeric membranes to
mimic the extracellular matrix, generating an extensive network
of cells. In this field, electrospinning and rotary jet spinning
techniques are highlighted due to the possibility of control the
membrane pore size, surface area, and fiber alignment. This
research explores both processing techniques in order to obtain
polyurethane membranes with different fiber morphologies to
explore the mechanical properties and in vitro cells studies.
The implants characterization showed that the morphology
and aligned of attachment cells influenced the cells viability,
and also showed an appropriate mechanical strain capable to
support cells attachment and proliferation. It was observed
that adequate polymer microsurfaces structures with aligned
architectures can promote cell proliferation and tissue repair
mimicking the extracellular matrix
e:
lais.gabriel@fca.unicamp.br