| abstract |
A honeycomb monolith, particularly useful as a catalyst or a support for a catalyst in selective catalytic reduction (SCR) of nitrogen oxides, comprising: a plurality of pore walls defining a plurality of polygonal channels, the plurality of pore walls and The channels extend parallel in the direction of fluid flow from the inlet end to the outlet end of the structure in a common direction. The transverse cross-section of the polygonal channel has the shape of a convex polygon in the closest packing, wherein more than 50% of the interior angles between two adjacent walls of the convex polygon are greater than 90°, and wherein the diameter of the holes is greater than LL /L S is greater than 1.5. At the two side edges of the monolith parallel to the longest direction of the holes/channels, the monolith has a row of polygons perpendicular to each other on the outer sides in the changing directions. |