Appeal No. 1997-2947
Application No. 08/352,079
The distance between catalyst A and adsorption catalyst B is preferably within a range of from 10
to 50 mm. (Specification, p. 7).
Independent claim 6 and dependent claim 7 are illustrative of the invention and read as
follows:
6. A catalyst for the purification of exhaust gases which comprises:
(a) a catalyst A comprising a honeycomb carrier and a three-way catalyst formed
thereon for purifying hydrocarbons, carbon monoxide and nitrogen oxide in the vicinity
of the theoretical air-fuel ratio; and
(b) an adsorption catalyst B comprising a honeycomb carrier and a zeolite layer
formed thereon for the effective adsorption of hydrocarbons, and wherein the absorption
catalyst B is located adjacent to, and on the downstream side of the catalyst A in the
direction of the flow exhaust gas and wherein the catalyst A and the absorption catalyst B
are 10-50 mm apart.
7. A device for the purification of exhaust gases according to the claim 6, wherein
the zeolite layer in the adsorption catalyst B is provided with a catalyst layer consisting
essentially of a metal selected from the group consisting of platinum, palladium, rhodium,
silver, copper, chromium, cobalt and neodymium as a catalyst component, and one or
more of activated ceria and alumina.
References
The prior art references of record relied upon by the examiner in rejecting the appealed
claims are:
Patil et al. (Patil) 5,125,231 Jun. 30, 1992
Dunne 5,142,864 Sep. 1, 1992
Abe et al. (Abe) EP 485,179 May 13, 1992
Patil, Dunne and Abe are available as prior art under 35 U.S.C. § 102(b).
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