II International Symposium on Carbon for Catalysis ABSTRACTS

PP-<strong>II</strong>-5
support; the procedure is followed by filtration and drying; (ii) the impregnation (IMP) using
an excess of solvent containing the exact amount of metal to be dispersed on the support, the
solvent being removed by evaporation.
Temperature programmed decomposition (TPD ec ) was performed on the carbon supports
from 298 to 1173 K (10 K/min). SCR catalytic tests with Cu/C catalysts were carried
out from 298 to 573 K (4 K/min), respectively. For SCR, the gas mixture was:
NO/NH 3 /O 2 /He = 0.02/0.02/3.00/96.6 with total flowrate = 138 cm 3 /min. Each catalytic test
was carried out with 0.02 g catalyst. The TPD ec and SCR effluent compositions were
monitored continuously by sampling on line to a quadruple mass spectrometer (Pfeiffer
Omnistar).
Results
The emission profiles of CO and CO 2 established from the TPDec of the three supports are
quite similar (CO : 400μmol.g -1 ; CO 2 : 170μmol.g -1 ). The WIM method allows higher metal
content compared to the IMP method. The Cu-free carbon samples exhibit a significant
activity for the SCR of NO above 533 K due to the direct reaction of carbon with NO. In
presence of copper and with a spatial velocity (VVH) = 95000 h -1 ), the reduction reaction of
NO by NH 3 starts between 403 and 433 K and shows a maximum in the 523 – 553 K
temperature range. Moreover the SCR efficiency increases both with the copper content and
with the pore size of the support.
References
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[5] L.-Y. Hsu and H. Teng, Appl. Catal. B: Env. 42 (2003) 69.
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