Abstracts Book - IMRC 2018

• SF3-P042
SELECTIVE CATALYIC REDUCTION (SCR) OF NOx IN THE PRESENCE
OF H2O/SOX/ CO OVER POROUS ALUMINA-BASED OXIDE
Jesuina Cassia S de Araújo 1 , Alcineia Oliveira 2 , Antônio de Brito S. Neto 3 , Rinaldo S. Araujo 4 ,
Monique Silva Souza 5
1 Universidade Federal do Espirito Santo - Centro Universitário Norte do Espírito Santo, Centro
Universitário Norte do Espírito Santo, São Mateus, Espirito Santo, Brazil. 2 Universidade Federal
do Ceará, DQAFQ, Brazil. 3 Universidade Federal do Ceará, DAFQ, Brazil. 4 Instituto Federal de
Educação -IFCE, Campus de Fortaleza, Benfica, Fortaleza, Ceará, Brazil. 5 Instituto Federal de
Educação -IFCE, Campus de Fortaleza,Fortaleza, Ceará, Brazil.
Selective catalytic reduction (SCR) of NO x in the oxygen-rich exhaust emission
lean burning engines remains one of the major challenges for environmental
catalysis. Particularly, alumina-based catalyst is known as one of the most
effective catalysts for the SCR of NO x due to its very high catalytic activity and
hydrothermal stability, even at a harsh reaction conditions. However,
deactivation of the metals oxides dispersed on alumina is the main drawback
during the catalytic runs. In this paper, the catalytic role of Pt and Ni species
dispersed on gamma-alumina during the SCR of NO x by CO is studied. The
physicochemical properties were characterized by X-ray diffraction and N 2
adsorption/desorption, FTIR, TEM, SEM-EDS and acidity measurements. It was
found that the porous properties of alumina provided the best catalytic results,
with conversions close to 90% at 350 o C. This was due to the fact that Pt exists
as extra-framework PtO x and nickel as ion exchange site as Ni 2+ , which have
been identified as the specific active sites for the SCR of NO x . When tested at
hash reaction conditions, such as high temperature thermal treatment in an H 2 O
or SO X or a mixture or them, such that activity was retained due to the stability
of the solid.
Keywords: Porous alumina, SCR, PtNi
Presenting authors email: alcineia@ufc.br