II International Symposium on Carbon for Catalysis ABSTRACTS

N 2 O CONVERSION USING BINARY MIXTURES OF IRON SUPPORTED ON
ACTIVATED CARBON
PP-I-9
Carabineiro S.A., Fernandes F.B. 1 , Vital J.S., Ramos A.M., Fonseca I.F.
Departamento de Química, REQUIMTE, CQFB
1 Departamento de Ciência dos Materiais, CENIMAT, Universidade Nova de Lisboa,
Faculdade de Ciências e Tecnologia, 2825-114 Caparica, Portugal
e-mail: iss@dq.fct.unl.pt
Although N 2 O is a pollutant gas that has an extremely long lifetime (about 150 years) and
plays a significant role in the depletion of the ozone layer, its harmful effects have been
virtually ignored in comparison with the attention given to NO. Relatively few studies exist of
the reaction of N 2 O with activated carbon [1-9].
In the present work the kinetics of N 2 O conversion reaction with activated carbon
impregnated with binary mixtures of 4%Fe with 4% of Co, Cu, Mg, Ni, Pb and V (4% in
metal weight for each precursors salts) was studied in the temperature range between 300ºC to
800ºC using a microbalance. Good synergetic effects were found. For the Fe+Mg and Fe+Pb
mixtures, the reaction rate at 350ºC increases, respectively, 3 and 6 times more than the sum
of the rates obtained for the individual components. At 600ºC, the reaction rate increases 2
times. For other mixtures, the effects were less notorious.
Figure 1 - N 2 O conversion (TPR) for carbon parent sample and
samples doped with with Pb, Fe and Pb+Fe binary mixture.
N 2 O conversion was also
followed using a differential
reactor connected to a GC/MS
apparatus (Figure 1). The reaction
products were N 2 and CO 2 , in
agreement with literature [1,4-7].
Also some CO was detected at
higher temperatures at higher
temperatures as shown before
[1,6,7].
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