Appeal 2007-0280
Application 10/469,392
14, 16-18, and 20-29 are the only claims pending in this application (Br. 2).
We have jurisdiction pursuant to 35 U.S.C. § 134.
According to Appellants, the invention is directed to a method of
reducing the content of NOx and N2O in gases, comprising the steps of
adding ammonia as a reducing agent, introducing the gas mixture into a
reaction zone containing one or more iron-laiden zeolites with no pores or
channels having a width greater than or equal to 7 Angströms, and setting a
specified temperature, flow rate, and space velocity to achieve the desired
degree of decomposition of N2O (Br. 2). Independent claim 14 is
representative of the invention and is reproduced below:
14. A method of reducing the content of NOx and N2O in gases,
which comprise the steps of:
a) adding ammonia as a reducing agent which can reduce NOx
and is gaseous under the reaction conditions to the NOx- and N2O-
containing gas in an amount of up to 1.33 (8/6) mol per mole of NOx,
b) introducing the gas mixture into an apparatus having a reaction
zone containing one or more iron-laden zeolites whose crystal
structure has no pores or channels having a width greater than or equal
to 7 Angström,
c) setting a temperature from 350 to 450ºC in the reaction zone
and selecting a flow rate of the gas mixture and/or the amount of
catalyst by passing the gas over the catalyst at a space velocity of
from 5 000 to 50 000h-1, based on the catalyst volume, so that the
desired degree of decomposition of N2O is achieved and the
temperature and flow rate of the gas mixture are set and/or the amount
of catalyst is chosen so that at least 50% of the N2O are decomposed
in the reaction zone.
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