Support, its production method and catalyst body

摘要

This invention aims at providing a direct support ceramic support having less degradation of a catalyst due to thermal durability, and capable of keeping a high catalyst performance for a long time and suppressing a change of characteristics of a substrate ceramic. According to the invention, one or more kinds of constituent elements of a substrate ceramic such as cordierite are replaced by an element such as W to form a ceramic body having at least one kind of elements and fine pores each capable of directly supporting a catalyst component. These elements or fine pores are arranged at only an outermost surface layer portion (a depth corresponding to 1,000 unit crystal lattices or below) of the substrate ceramic. A catalyst body undergoing less thermal degradation and having small influences on the characteristics of the substrate ceramic is thus obtained.