High-performance catalyst support
A catalyst support is formed of a monolith having corrugated metal leaves. The corrugations of each leaf are oblique relative to the edges of the leaf. Each leaf extends from an interior region to an exterior region, and has corrugations that are non-parallel to the corrugations in an adjacent leaf. Each leaf also includes slits, and is coated with a suitable catalyst. A set of monoliths, made as described above, are stacked within a cylindrical pipe. The corrugations define gas flow channels, which enable heat applied to the exterior of the pipe to travel to the center of the monolith, and back to the outside. The support of the present invention thus facilitates heat transfer to essentially all regions of the monolith. The invention also inherently overcomes the problem associated with thermal mismatch between the metal pipe and a ceramic catalyst material.
1. A catalyst support comprising a plurality of monoliths arranged within a generally cylindrical pipe, each of said monoliths having an exterior region, in a vicinity of said pipe, and an interior region, each of said monoliths comprising a plurality of corrugated metal leaves, each leaf being coated with a catalyst effective to catalyze a catalytic reaction, said corrugated leaves defining a plurality of gas flow channels, some channels adapted to lead gas from the exterior region to the interior region and other channels adapted to lead gas from the interior region to the exterior region.
2. The catalyst support of claim 1 , wherein each of said monoliths comprises at least three of said leaves.
3. The catalyst support of claim 1 , wherein each leaf has a pair of longitudinal edges, and wherein each leaf has corrugations which are oblique relative to said longitudinal edges.
4. The catalyst support of claim 1 , wherein each leaf has a plurality of slits.
5. The catalyst support of claim 3 , wherein each leaf has a plurality of slits.
6. The catalyst support of claim 1 , wherein each leaf extends from a cylindrical shoe in a vicinity of the interior region towards an interior surface of said pipe.
7. The catalyst support of claim 4 , wherein each corrugation defines an apex, and wherein the slits penetrate part of the apex.
8. The catalyst support of claim 1 , wherein each leaf has a spiral shape terminating in a vicinity of said exterior region.
9. The catalyst support of claim 1 wherein corrugations of adjacent leafs have mutually opposite orientations.
10. A method of making a catalyst support, comprising:
a) forming corrugations in a plurality of pieces of metal, such that the corrugations are skewed relative to an edge of each piece of metal,
b) arranging adjacent pieces such that their corrugations are of mutually opposite orientations and attaching said pieces to a generally flat shoe,
c) bending said shoe upon itself to define a generally cylindrical central member, while bending said pieces such that they curve outwardly from the central member to an exterior region, and
d) enclosing said pieces in a wrapping means.
11. The method of claim 10 , further comprising the step of forming a plurality of slits in each of said pieces.
12. The method of claim 10 , further comprising stacking a plurality of catalyst supports, made according to steps (a) through (d), in a generally cylindrical pipe.
13. The catalyst support of claim 1 , wherein each of said monoliths comprises at least six of said leaves.
14. The catalyst support of claim 3 , wherein said corrugations form an angle of about 45° relative to one of said longitudinal edges.
15. The catalyst support of claim 1 , wherein the corrugations of adjacent leaves are non-parallel to each other.
16. The catalyst support of claim 1 , wherein the corrugations in one leaf are oriented to lead gas from the exterior region to the interior region and wherein the corrugations in the adjacent leaf are oriented to lead gas from the interior region to the exterior region.