II International Symposium on Carbon for Catalysis ABSTRACTS

OP-I-11
DENITROGENATION ACTIVITY OF Cu-Mn CATALYSTS SUPPORTED ON
MINERAL, CARBON AND MINERAL CARBON MATERIALS
Kulazynski M., Walendziewski J., Bratek K.
Faculty of Chemistry, Department of Fuels Chemistry and Technology,
Wroclaw University of Technology, 50-344 Wroclaw, ul. Gdanska 7/9, Poland
e-mail: marek.kulazynski@pwr.wroc.pl
Three groups of catalytic techniques, known as deNO x processes, can be applied for the
removal of nitrogen oxides: no-selective reduction, selective catalytic reduction and
decomposition. All of them eliminate nitrogen oxides by converting them to nitrogen, with
water, carbon dioxide and/or oxygen appearing as nontoxic byproducts.
Four different supports were used in preparation of DeNOx catalysts: natural
silicaalumina, active coke (grains), mineral carbon (monoliths) and cordierite monoliths
coated with active carbon. On the base of our earlier studies we have found that the optimal
active phase composition for carbon containing catalysts is 3 wt % Mn and 1.75 wt % Cu.
Catalysts were prepared by dry impregnation metals using salt solutions of Cu and Mn and
the concentration of the used salt solutions allowed obtaining the optimal metals content in
the final catalysts. The base physicochemical properties, mechanical strength, porous
structure and specific surface area of the catalysts were determined.
The activity studies were realized in laboratory flow equipment composed of model gas
feeding system and dosage system, reactor and analyzer for determining the content of nitric
oxide in the gas. The conditions of the process were: temperature range from 100 o C to
200 o C, for carbon containing catalysts and 100-450 o C for mineral catalyst, GHSV=5 000 h -1 .
Model gas contained 6 vol. % O 2 , NO content was changed in the range 400- 600 ppm, ratio
NH 3 /NO was equal to 1, and water vapor content in the model gas was ~ 1 %. Composition of
model gas and reaction mixture was analyzed using the MSI 2500 Analyzer.
Active coke, grain form, was from commercial delivery (Hajnówka, Poland), and its
basic properties were as follows, iodine number 200 mg I 2 /g., C/H/N/S composition:
96/0.9/09/0.5 wt %, respectively. The prepared mineral-carbon monoliths contained 30 wt %
of natural clay (as a binder). They were also characterized by dimensions, 1000x100x100
mm, wall thickness 2.7 mm and 121 (cells) longitudal channels (11x11). Pore volume attained
value 0.69 cm 3 /g and specific surface area ca 415 m 2 /g, mainly micropores. Natural clay ,
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