Method for processing an edge of catalyst-supporting honeycomb structure in exhaust gas denitration apparatus

A method for processing an edge of a catalyst-supporting honeycomb structure in an exhaust gas denitration apparatus, comprising:

• dipping a denitration catalyst-supporting honeycomb structure, formed by alternately laminating a corrugated plate-like inorganic fiber sheet and a flat plate-like inorganic fiber sheet, in a slurry containing a silica sol, titania particles, and ammonium metavanadate to form a whole primary denitration catalyst layer;
• dipping the edge of a gas inlet side of the denitration catalyst-supporting honeycomb structure having the whole primary denitration catalyst layer in a denitration catalyst-containing slurry for edge processing comprising a silica sol, titania particles or kaolin particles, and ammonium metatungstate to form a coating layer on the edge of the denitration catalyst-supporting honeycomb structure;
• and
• drying and calcinating the edge of the denitration catalyst-supporting honeycomb structure to form an edge secondary denitration catalyst layer,
• wherein a catalyst supporting amount of the whole primary denitration catalyst layer of the denitration catalyst-supporting honeycomb structure is from 100 to 300 g/m2, a catalyst supporting amount of the edge secondary denitration catalyst layer is from 100 to 300 g/m2, and a catalyst supporting amount in the edge of gas inlet side of the denitration catalyst-supporting honeycomb structure is from 400 to 500 g/m2 in total.