Abatement of N2O in the selective catalytic reduction of NOx on platinum zeolite catalysts upon promotion with vanadium
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Yvonne Traa, Beate Burger and Jens Weitkamp
Abstract
The selectivity to N2O during the selective catalytic reduction of NOx on platinum-containing zeolite catalysts is reduced by incorporation of vanadium into the catalyst.
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The catalytic experiments were performed in a flow-type apparatus with
a fixed-bed reactor at atmospheric pressure. The gaseous components of
the model exhaust gas were premixed and afterwards saturated with
water vapour at 45 °C. Typically, the feed contained ca. 0.02 vol% NOx,
0.06 vol% C3H6, 0.03 vol% CO, 4 vol% CO2, 9 vol% O2 and 10 vol%
H2O in He at a flow rate of 150 cm3 min–1. Tests with water
concentrations of 6.6 and 3.3 vol% revealed that the influence of water
on the average NOx conversion is small. The mass of the hydrated
catalyst amounted to 200 mg. The product stream was analysed for NOx
with a chemiluminescence detector; all other components were analysed
by capillary gas
chromatography.
Amplitude of the oscillations as difference between maximum and
minimum NOx conversion.
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