Mini-monolith substrate

Details Mini-monolith substrate Mini-monolith substrate

1988-07-18

1989-10-31

Shine, W. J.

Catalyst, solid sorbent, or support therefor: product or process

Miscellaneous

502527, B01J 3200, B01J 3504

Patent

active

048777668

ABSTRACT:
A rigid mini-monolith structure formed by extrusion from a die. Such structures are useful as catalyst supports for treating exhaust gases from automobile. The structure is in the shape of a right circular cylinder with a plurality of internal cells extending along the substrate and an opening on both ends. In order to provide maximum crushing strength of the structure, as well as permitting uniform intercell wall thickness at the downstream face of the extrusion die which forms the structure, the majority of the cells are formed in the transverse cross section of a truncated (circular) sector and have the property that they each possess the same hydraulic diameter, although not all are of the same transverse cross sectional shape. The invention also is defined by a novel extrusion die formed by a plurality of concentric, collared tubes provided with longitudinally running slots in the tubes and notches on the collars, the tubes being radially spaced from each other. The non-slotted portions of the tubes define the cells of the extruded structure.

REFERENCES:
patent: 4042738 (1977-08-01), Gulati
patent: 4233351 (1980-11-01), Okumura et al.
patent: 4358428 (1982-11-01), Fujita et al.
patent: 4533584 (1985-08-01), Takeuchi et al.
patent: 4742038 (1988-05-01), Matsumoto

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