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8
OPERATING PRINCIPLE OF THE CONVERSION
The conversion of nitrogen dioxide NO
reaction equation:
The reaction equilibrium is shifted at room temperature onto the side of the original material NO
of the equilibrium towards the products and the resultant high product yield can only be achieved as
subject to a high-energy input, i.e. increase of temperature.
A nearly 100 % conversion of NO
tridge filled with a metal catalyst within a temperature range of 620 to 680 °C [1148 to1256 °F].
The energy input can be reduced explicitly by using a carbon-molybdenum based catalyst. With this
type of catalyst, a nearly complete conversion of NO
320 to 380°C [608 to 716 °F].
The catalyst is supplied as a ready-to-use formatted cartridge.
Dust-loaded gases may choke up the catalyst filling. For this reason, an ap-
propriate gas conditioning system is to be mounted upstream of the convert-
ers CG... in order to separate out suspended particles!
N O T E !
For converters with unheated sample gas in- and outlet at dew points above
10 °C [50 °F] a sample gas drying/cooling shall be provided!
N O T E !
To minimize the loss of NO
tion of the NO
reference measuring method) the usage of sample gas coolers is not allowed in case
x
the NO
fraction is higher than 10 % of the NO
2
If the dew point simultaneously is higher than 10 °C [50 °F], a converter with heated in- and outlet has
to be used ('hot gas converter').
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into nitrogen monoxide NO passes according to the following
2
2 NO
2
and therefore a complete conversion to NO is achieved with a car-
2
in the sample gas conditioning, according to DIN EN 14792:2005 (descrip-
x
content (note: because of the high solubility of NO
x
CG-2 | 1.04.00
2 NO + O
2
to NO is achieved within a temperature range of
2
. A shift
2
).
2
11
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