Catalyst for exhaust emission control, production method thereof, control apparatus and exhaust emission control method using the apparatus emission.

摘要

A catalyst structure for purifying exhaust gas comprising a stack of two or more catalyst elements (1) and a frame (2) to house the stack, forming each of the catalyst elements (1) from a substrate in sheet form rectangular or square planar, in each of the catalyst elements (1) are flat plate portions (5) and portions of change of level (4) as ladder alternately formed in the direction parallel to a pair of sides shaped substrate plate at a predetermined interval, each carrying the catalyst elements (1) a catalyst component on its surface, establishing in each catalyst element (1) a ratio of p s between the length p of the plate portions flat (5) and the height s of the portions of level change (4), the angle formed between the surface portions of level change (4) and the surface of the flat plate portions (5) below 90 ° form ndo the catalyst elements (1) flow passages gas with rectangular or rhombic cross section between the adjoining catalyst (1) elements, including each of the catalyst elements (1) a metal, ceramic, or glass substrate netlike in the mesh is coated at least one catalyst component selected from the group consisting of titanium oxide, vanadium oxide, molybdenum oxide, and tungsten oxide to fill the meshes, and piling the catalyst elements (1) such that elements contiguous catalysts (1) contact each other at least in overlapping portions of the flat plate portions (5) with portions of level change.