Appeal No. 1997-2947
Application No. 08/352,079
comprising: 1) a zeolite adsorbent which may contain a catalyst supported thereon; 2) a heater
having a honeycomb structure which may contain an adsorbent or adsorbent-catalyst composition
coated on the honeycomb structure; and, 3) at least one monolith catalyst. (Page 3, lines 5-19
and page 5, lines 28-31).
The zeolite adsorbent (1) may employ any structure, however, a honeycomb structure is
preferable in view of potential pressure loss. (Page 8, lines 34-35). As mentioned above, the
zeolite adsorbent (1) may contain a catalyst, such as platinum, supported thereon. (Page 5, lines
8-11 and Example 3). The heater adsorbent-catalyst (2) having a honeycomb structure is
preferably formed from a zeolite adsorbent and a noble metal catalyst, such as platinum,
palladium or the like. (Page 6, lines 9-10). Additionally, the heater adsorbent-catalyst (2) can
function as a three-way catalyst when rare earth metal oxides and/or alkaline earth metal oxides
are added to the adsorbent zeolite. (Page 6, lines 34-37). The main monolith catalyst (3) is
preferably a three-way catalyst which may be supported on a ceramic honeycomb structure.
(Page 8, lines 32-33 and Example 1).
The zeolite adsorbent (1), heater adsorbent-catalyst (2) and the monolith catalyst (3) may
be employed in a variety of configurations. Preferable configurations includes those depicted in
Figures 1(a) to 1(f). (Page 5, lines 28-31). According to Abe, Figures 1(c) to 1(f), where the
monolith catalyst (3) is placed upstream, are preferable because the zeolite adsorbent-catalyst (1)
and the catalyst on the heater adsorbent-catalyst (2) are resistant to deactivation and have
excellent durability. (Page 5, lines 41-45).
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Last modified: November 3, 2007