Appeal No. 94-3479
Application 07/917,261
DECISION ON APPEAL
This is an appeal from the final rejection of claims 15 to
22, all the claims remaining in the application.
The subject matter on appeal is directed to a method of
treating emissions from a fossil-fueled engine using lean-burn
combustion, the emissions having an oxygen content of 1.5 to
10.0%. The method comprises three steps: (a) injecting a
saturated hydrocarbon reductant into the emissions entering a
two-stage catalyst, (b) exposing the injected emissions to a
first stage catalyst having highly acidic gamma alumina, and (c)
exposing the effluent from the first stage to a downstream
oxidation catalyst acting as the second stage.
In their brief, appellants do not separately argue any of
their claims and thus claims 15 to 22 stand or fall together with
independent claim 15 which reads as follows:
15. A method of treating the emission from a fossil-fueled
engine, using lean-burn combustion, the emission having an exygen
content of 1.5-10%, the method comprising:
(a) injecting a hydrocarbon reductant selected from the
group consisting of straight chain, branched chain, or aromatic
hydrocarbons or oxygenated compounds, said hydrocarbon reductant
being injected into the catalyst stream entering a first stage
nitric oxide reduction catalyst comprised of highly acidic gamma
alumina;
(b) exposing the injected stream to the nitric oxide
reduction catalyst and
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