Catalyst – solid sorbent – or support therefor: product or process – Miscellaneous
Patent
1990-05-23
1991-11-26
Shine, W. J.
Catalyst, solid sorbent, or support therefor: product or process
Miscellaneous
502527, B01J 3200, B01J 3504
Patent
active
050682180
ABSTRACT:
In the honeycomb metal catalyst apparatus having a roughly cylindrical metal catalyst carrier body formed by spirally and alternately winding a first large-wave-pitch sheet-metal layer and a second small-wave-pitch sheet-metal layer in stacked fashion so as to form a great number of honeycomb gas flow conduits, the ratio in wave pitch of the first layer and the second layer is determined as 0.75<P.sub.2 /P.sub.1 <1.0, whose ratios are not determined by two relatively small integers. This is because since the contact points between the first and second corrugated sheet-metal layers are shifted little by little out of phase from each other along the circumferential direction of the carrier body, it is possible to decrease the undesirable chances that the troughs (or the crests) of the first corrugated sheet-metal layer are in contact with the crests (or the troughs) of the second corrugated sheet-metal layer or vice versa or to increase the periodic circumferential dimension between two same-phase contact points of the two corrugated layers or to obtain an even distribution in cross-sectional shapes of the honeycomb gas flow conduits, without being subjected to the influence of dimensional errors of the two corrugated sheet-metal layers.
REFERENCES:
patent: 4098722 (1978-07-01), Cairns et al.
patent: 4818746 (1989-04-01), Cyron
patent: 4845073 (1989-07-01), Cyron
Nissan Motor Co,. Ltd.
Shine W. J.
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