Honeycomb filter and method for manufacturing the same

Abstract

A honeycomb filter including a catalyst-carrying article, and an outer peripheral coat layer disposed on an outer peripheral face of the catalyst carrying article, wherein an amount of the catalyst loaded in the outer peripheral coat layer at a position 50 μm or more apart from a boundary face between the catalyst-carrying article and the outer peripheral coat layer is 5 mass % or less when a measurement piece having a cross section where a boundary portion between the catalyst-carrying article and the outer peripheral coat layer can be observed and being obtained by embedding a resin in the boundary portion in the cross section is measured by an energy dispersive fluorescent X-ray analysis using a scanning electron microscope.

1 . A method for manufacturing a honeycomb filter comprising:
 a step (1) where a bonding article is obtained by bonding a plurality of honeycomb segments each having a cell structure having a plurality of cells separated and formed by porous partition walls and an outer wall disposed in the outer periphery of the cell structure at the outer wall, followed by grinding an outer peripheral portion of the bonding article to obtain a periphery-ground article,   a step (2) where a catalyst-carrying article is obtained by loading a catalyst on the partition wall of the periphery-ground article, and   a step (3) where an outer peripheral coat layer is disposed on the outer peripheral face of the catalyst-carrying article to obtain an outer periphery-coated article.   
     
     
         2 . The method for manufacturing a honeycomb filter according to  claim 1  further comprising a step (4) where the outer periphery-coated article is heated to fix the catalyst on the partition walls after the step (3).